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IRJET- Stress Analysis of a Leaf Spring Suspension System with the Combination of Helical Springs
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 76 Stress Analysis of a Leaf Spring Suspension System with the Combination of Helical Springs Jayesh Sanjay Patil Mechanical Engineer, Akurdi Chikhali Road, Chinchwad, Pune, Maharashtra, India – 412114 -----------------------------------------------------------------------***------------------------------------------------------------------------ ABSTRACT:- This research article deals with a modified version of leaf spring suspension system introduced for the optimization of existing leaf spring suspension system design, by the combination of two helical springs with the master leaf. To furnish this end, a semi-elliptical type mono leaf spring of light-weighted mini truck is considered for design and modelling work. On both the sides of this mono leaf, a helical spring is designed and modelled at equal distances from the center of the leaf. All the modelling and analysis work is performed in CATIA- V5R20. Stress analysis results at various loading conditions are obtained by both theoretical and FEA methods, separately for typical mono leaf spring model and proposed model with helical springs. Results show an average 8.3% stress reduction for any of the loading conditions, by the utilization of helical springs with the combination of the master leaf. The proposed work has some certain benefits which could transform the existing leaf spring design into a more optimized, stable and flexible one for the overall better performance and comfort to passengers. KEYWORDS Leaf spring, helical spring, FEA, stresses, CATIA INTRODUCTION Springs are key elements of any suspension system and first line of its defense. Leaf springs and helical springs both are two basic types of suspension springs. Leaf springs, especially the longitudinal laminated type are reliable and persistent element in automotive suspension system [1], and helical springs are also one of the mechanical elements used in several industrial applications and automobile vehicles to satisfy the desired functions [2]. Generally, helical springs are made of an elastic material formed into the coil shape which returns to its initial length when unloaded [3]. Leaf springs are commonly formed by stacking leafs or plates of steel in progressively longer lengths on top of each other, so that the spring is thick in the middle portion to resist bending and thin at the ends where it attaches to the body [4]. Increasing the energy storage capability of a leaf spring ensures a more compliant suspension system [5] Both the springs as a suspension element have their specific benefits and some limitations. So, a leaf spring can be used in conjunction with helical spring to enhance the spring rate adjustability function for chassis set up balance and for overall better performance of the suspension system. The first automotive helical spring was on the model- T (Ford) in 1910, where the suspension system was a combination of leaf spring and helical spring. The design of this leaf and helical spring suspension was totally different from the model presented in this work. Taking consideration of these above- mentioned approaches, in this presented work, a conventional steel leaf spring (master leaf) is combined with two helical springs, each at both the sides of leaf spring. Modeling and analysis results showed very significant overall stress reduction in combined design compared to typical leaf spring model without helical spring. Several research articles were devoted on researches related to suspension springs. Research works which have been done by researchers in the past are very useful for efficient designing of the proposed model, specially the papers on helical springs; because the overall better performance of the existing model will mainly depend upon the design of employed helical springs. Jiang and Henshall presented a general and correct finite element model (FEM) for helical springs subjected to axial loads. Vebil Yildirim and Ecosanctuary presented a detailed analysis of free vibration frequencies of a composite helical spring. DESIGN AND MODELING Following sections describe the designing and modeling procedures carried out for typical (conventional) and proposed mono leaf spring models: Modeling of Typical Mono Leaf Spring: A typical single leaf spring is designed and modeled in CATIA-
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 77 V5R20. The designed and modeled mono leaf in fact is a master leaf of any semi-elliptical leaf spring suspension system, employed in light vehicle mini trucks and buses. Modeling in CATIA-V5R20 is done considering the dimensions and properties as mentioned in Table 1 and selecting isotropic structural steel as design material [4]. Figure 1 is showing the design of this mono leaf spring model. Table 1: Dimensions and Physical Properties of Mono Leaf Spring Model Sr no. Description Specification 1 No. of Leaf 01 2 Width of leaf (b) 60 mm 3 Thickness of Leaf (t) 16 mm 4 Eye to Eye length of leaf (L) 1025 mm 5 Camber 90.8 mm 6 Poisson’s Ratio (µ) 0.266 7 Density of material (p) 7860 kg/m^3 8 Coefficient of thermal expansion 1.17x10^-5 K^-1Deg 9 Young’s Modulus (E) 2x10^5 N/mm^2 10 Yield Strength 250 N/mm^2 11 Material Type Isotropic, Structural Steel 12 Weight 21.23 kg Fig. 1: Typical Mono Leaf Spring Model DESIGNING THE MONO LEAF SPRING WITH COMBINATION OF HELICAL SPRINGS Taking the same design parameters, dimensions and physical properties as mentioned in Table 1 of mono leaf spring, the model of leaf spring with combination of helical springs is designed in same software CATIA-V5R20. First of all, previously designed mono leaf spring part is inserted in CATIA-V5R20 and then at both the sides of mono leaf spring surfaces which are selected as a best location to mount the helical springs, a small rectangular platform of 60 mm ×100 mm is made with a little height. On this platform through the accurate axis helical spring is designed and modeled using the wireframe feature of CATIA-V5R20. Number of coil turns in each helical spring is taken six. Both the helical springs are located at equal distance from the center hole on leaf spring surface. Center to center distance between both the helical springs is 960 mm. To fix the helical springs from upper side, a square shaped platform of 150 mm ×150 mm ×10 mm is created, which is firmly attached with the top most coil of each helical spring.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 78 Fig. 2: Proposed Leaf Spring Model with Combination of Helical Springs. Table 2: Dimensions and Physical Properties of Helical Springs. Sr. No. Description Specification 1 No. of Helical Springs 2 2 Height of each helical spring h 136 mm 3 Wire Diameter d 10 mm 4 Inner diameter of coil D 70 mm 5 Pitch p 22.6 mm 6 No. of Coils n 6 7 Poisson’s ratio µ 0.266 8 Density of material p 7860 kg/m^3 9 Coefficient of thermal expansion 1.17x10^-5 K^-1Deg 10 Young’s Modulus E 2x10^5 N/mm^2 11 Yield Strength 250 N/mm^2 12 Material Isotropic, Structural Steel 13 Weight of each helical 4.3 kg Total weight of combined model is 34.23 kg. Total vertical height of each helical spring is 136 mm. The dimensions and properties of both the identical helical springs are covered in Table 2. And, the designed model with combination of leaf and helical springs is shown in Figure 2. Histopathological examination of the heart tissue also showed that MSG induced myocardial infarction observed as areas of necrotic lesion in the cardiac tissue of the rats treated with MSG. STRESS CALCULATIONS AND ANALYSIS The theoretical maximum stresses and FEA stresses produced in typical mono leaf spring model and proposed modified model, at various loading conditions are calculated and analyzed as described in following sections. Theoretical Stress Calculation of Typical Mono Leaf Spring Model The design of mono leaf spring modeled in CATIA-V5R20 is a uniform width master leaf of a semi elliptical leaf spring. It is like a simply supported beam of uniform width, clamped at both the ends during the loading conditions. Therefore, the theoretical maximum bending stresses produced in this mono leaf spring model will be calculated by the following equation [21]:
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 79 Maximum Bending Stress, σ max= pWL/Nbt2 Eq (1) Where, p=3 (a constant for simply supported beam of uniform width) L=eye to eye distance=1025 mm, N=number of leafs =1, b=width=60mm, t=thickness=16mm Case (1): At load W=1000 N Maximum Stress (Bending) σ max=100.09MPa Case (2): At load W=1500 N Maximum stress σmax=150.14MPa Similarly, other calculations can also be done at various incremental loads to find out the maximum stresses produced in the mono leaf spring model by Eq. (1). Table 3 shows these theoretical stresses at various loading conditions. Table 3: Theoretical Maximum Stresses in Mono Leaf Spring Model. Sr. No. Applied load N Theoretical stresses MPa 1 1000 100.09 2 1500 150.14 3 2000 200.19 4 2500 250.24 5 3000 300.29 6 3500 350.34 7 4000 400.39 8 5000 500.48 9 7000 700.68 10 10000 1000.97 11 15000 1501.46
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 80 STATIC STRUCTURAL ANALYSIS OF TYPICAL MONO LEAF SPRING MODEL The static structural analysis of the mono leaf spring model is carried out using the finite element analysis (FEA) in CATIA- V5R20. The load is applied at the center point of leaf spring (as shown in Figures 3–6) in upward direction. Meshing of the model is done with octree tetrahedron mesh elements. For all the model analysis in this work it is kept the same. Figures 5 and 6 are showing the mesh generation in models with stress analysis results. By applying the load and performing analysis and simulation, we get the stress distribution over the whole span of leaf, in the numeric as well as in the form of color scheme. By varying the load in constant but incremental order, and keeping all the parameters and conditions unchanged, stress analysis is carried out, and various result oriented informational images are captured. Figures 3–6 are showing the distribution of Von- Mises stresses produced in mono leaf spring model at varied loads by FEA in CATIA-V5R20. From Figures 3–6, it can be observed that the maximum stress level is near the center position of leaf where load was applied and near the eye ends. Fig. 3: Stresses in Mono Leaf Spring Model at Load 1000 N. Fig. 4: Stresses in Mono Leaf Spring Model at Load 1500 N.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 81 Fig. 5: Stresses in Mono Leaf Spring Model at Load 3000 N. Fig. 6: Stresses in Mono Leaf Spring Model at Load 5000 N.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 82 STATIC STRUCTURAL ANALYSIS OF COMBINED LEAF AND HELICAL SPRING MODEL The static structural analysis of proposed combined leaf and helical spring model is carried out similarly as discussed above. Figures 8–11 are showing the finite element analysis results pertaining to stresses produced in this model at varied loads by CATIAV5R20. From Figures 8–11, it is clear that the maximum stress level is still near the center point of leaf where load is applied and near the eye ends, but now stress level is reduced here significantly (i.e. more than 8–10 MPa based on load), compared to typical mono leaf spring model as shown in Figures 3–6. Stress levels on helical springs are very low. Therefore, helical springs could be imagined in safe condition from the severe effects of stresses. All the stress analysis results of this model are shown in Table 4 and described in Figure 12 with a plot between loads versus stress diagram. Graph 1: FEA Stresses in Typical Mono Leaf Spring Model. Fig. 8: Stresses in Combined Model at Load 1000 N.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 83 Fig. 9: Stresses in Combined Model at Load 1500 N Fig.10: Stresses in Combined Modal at Load 3000 N.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 84 Fig. 11: Stresses in Combined Model at Load 5000 N. Graph 2: FEA Stresses in Combined Leaf with Helical Springs Model.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 85 RESULTS AND DISCUSSIONS The outcomes of the whole study and accomplished work are described under the following sub sections. All the stress analysis results are tabulated in the form of Table 4, and their correlations are shown in Figures 13 and 14. From the mentioned Table, Figures and stress analysis colored images, it is clear that the maximum stresses produced in proposed combined leaf and helical springs model are significantly less than the theoretical bending stresses (by mathematical calculations) and FEA Von-Mises stresses by CATIA-V5R20, induced in typical mono leaf spring model of same dimensions and parameters. Therefore, the design of introduced combined leaf and helical spring’s model can be said safe and considerable. The average % reduction in overall maximum stresses at different loading conditions is achieved by 8.3%, by the utilization of proposed combined model in comparison to typical mono leaf spring model (Table 5). Table 4: Comparison of Stress Analysis Results (M Pa). Sr. No. Applied Load N Theoretical stresses in mono leaf spring MPa Stresses in mono leaf spring by FEA (MPa) Stresses in proposed model by FEA (MPa) 1 1000 100.09 99.28 91.72 2 1500 150.14 148.92 137.60 3 2000 200.19 199 183.40 4 2500 250.24 248.20 229.32 5 3000 300.29 298.00 275.18 6 3500 350.34 347.50 321 7 4000 400.39 397.10 367 8 5000 500.48 496.40 459 9 7000 700.68 695.00 642 10 10000 1000.97 993 917 11 15000 1501.46 1490 1375.90 Graph 3: Comparison of Stress Analysis Results (Using Line Graph).
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 86 Graph 4: Comparison of Stress Analysis Results (Using Column Graph). Table 5: % Reduction of Stresses by Combined Model. Sr. No. Load N Theoretical maximum stresses in mono leaf spring model MPa FEA stresses in combined model with helical springs MPa Stress reduction in % 1 1000 100.09 91.72 8.36 2 15000 150.14 137.60 8.35 3 2000 200.19 183.40 8.38 4 2500 250.24 229.32 8.35 5 3000 300.29 275.18 8.36 6 3500 350.34 321 8.37 7 4000 400.39 367 8.34 8 5000 500.48 459 8.30 9 7000 700.68 642 8.37 10 10000 1000.97 917 8.38 11 15000 1501.46 1375 8.36
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 87 Benefits and Scope of the Proposed Model Following points describe the advantages of the proposed model: By incorporating such suspension springs model overall stresses can be reduced significantly. By applying properly designed helical springs, deflection characteristics of leaf spring suspension can be controlled and maintained, so as to achieve optimized comfort during the vehicle ride [22]. Number of graduated leafs in existing conventional leaf spring system could be reduced by employing proposed model. So, a new compact design of existing leaf spring system could be possible. A good balance between stiffness and rigidity of the typical leaf spring suspension could be maintained, so energy storage capacity can be increased by using such model to optimize the overall performance of the suspension. It seems, no necessity of heavy changes in any accessory part or design of existing leaf spring suspension to incorporate proposed model. CONCLUSION The improved efficiency and optimized performance of the presented combined leaf and helical spring’s suspension system model will majorly depend upon the best combination of design parameters of helical springs (i.e. wire diameter, pitch, number of coils) in proportion to leaf spring’s design. Therefore, by maintaining the best combination of these suspension spring’s design parameters, we can take advantages of benefits of each type suspension spring. And, this is to achieve a more optimized, flexible, stable and efficient typical leaf spring suspension system by incorporating the proposed designed model. NOMENCLATURE σmax Maximum bending stress L Eye-to-eye length of leaf spring b Width of leaf spring t Thickness of leaf spring p A constant for simply supported beam p Pitch of helical spring W Applied load N Number of leafs FEA Finite element analysis μ Poisson’s ratio ρ Density of material E Young’s modulus h Height of helical spring d Wire diameter of helical spring D Inner coil diameter of helical spring n Number of coils in helical spring
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 09 | Sep 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 88 REFERENCES 1. Gebremeskel SA. Design, Simulation and Prototyping of Single Composite Leaf Spring for Light Weight Vehicle. Global Journal of Researches in Engineering (GJRE). Mech Mech Eng. 2012; 12(7): 21– 30p. 2. Roy DK, Saha KN. Nonlinear Analysis of Leaf Springs of Functionally Graded Materials. Chemical, Civil and Mechanical Engineering Tracks of 3rd Nirma University International Conference (NUICONE 2012). Procedia Eng. 2013; 51: 538– 43p. 3. Sorathiya M, Dhaval SB, Vipul BM. Various Numerical Analysis of Composite Leaf Spring for Light Vehicle Mini Truck. Selected Papers of Mechanical, Civil and Chemical Engineering Tracks of the 4th Nirma University International Conference on Engineering (NUICONE 2013). Procedia Eng. 2014. 4. Kosec L, Nagode A, Kosec G et al. Failure Analysis of a Motor-Car Coil Spring. Case Studies in Engineering Failure Analysis. 2015; 4:100–5p. 5. Jiang WG, Henshall JL. A Novel Finite Element Model for Helical Springs. Finite Elem Anal Des. 2000; 35:363–77p. 6. Senthil Kumar M, Vijayarangan S. Analytical and Experimental Studies on Fatigue Life Prediction of Steel and Composite Multi-Leaf Spring for Light Passenger Vehicles Using Life Data Analysis. Mater Sci. 2007; 13(2): 141–46p.
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