Material Parameter Identification of Concrete by an Impact (Combination of RADIOSS & HyperStudy)

790 views
522 views

Published on

The development of modern electric power tools for professional applications requires special attention to be simultaneously paid to the two main groups of characteristics: those which take into consideration the efficiency and user comfort of the tool, and those which determine the robustness and durability of the devices. For the fulfillment of these two groups of attributes, computer-aided simulations using the finite element software Radioss® in combination with HyperStudy® and has become central to the development process of Stanley Black & Decker Deutschland GmbH. The computer aided simulations are used throughout the development cycle - from the pre-development phase, right up to testing near-series prototypes and beyond to improving design based upon product-failure returns.

From the point of view of the performance and durability of our machines, it is our goal to design products to ever higher standards. To achieve and surpass the exacting requirements of our professional customers, one key factor is to increase the performance of the machines. There are many factors which together contribute to achieve the best performance of the impact parts. To optimize the performance it is necessary to understand first, how is the material behavior during an impact like concrete. A verification of test and simulation will be achieved by the material parameter identification with Radioss® in combination with HyperStudy®. This combination helps Stanley Black & Decker Deutschland GmbH to develop more powerful professional tools.

Published in: Engineering, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
790
On SlideShare
0
From Embeds
0
Number of Embeds
65
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Material Parameter Identification of Concrete by an Impact (Combination of RADIOSS & HyperStudy)

  1. 1. 1 Material parameter identification of concrete by an impact (Combination of Radioss & HyperStudy) by Vitali Almendinger
  2. 2. 2 Agenda • Company/ Product introduction • Hammer description • Measurement/ Simulation principle • Mesh Size/ Properties • DOE • Definition of design variables/ Specifications • Definition of the responses: characteristic measures of test curve • DOE results • Optimization and results
  3. 3. 3 Company/ Product introduction Today DEWALT is a leading brand of professional power tools in the world and in the last 5 years the fastest growing power tool brand in the world. Compact Hammers Mid Size Hammers Demolition Hammers
  4. 4. 4 Hammer description
  5. 5. 5 Initial Velocity Gravity Measurement Points Measurement/ Simulation principle BCS mid Nodes DOF (0,0,1) Equivalent Nodes BCS Block DOF (0,0,0) Ram Drill Concrete Core Concrete Block /MAT/LAW1 /MAT/LAW24
  6. 6. 6 Measurement/ Simulation principleVelocityofRam[m/s]VelocityofDrill[m/s] Time [ms] Time [ms]
  7. 7. 7 Measurement/ Simulation principle Statistical Reference CurveMeasurement Curves
  8. 8. 8 Mesh Size/ Properties
  9. 9. 9 Mesh Size/ Properties Mesh parameters • Concrete parts only HEX-Mesh • Concrete Core constant Mesh size of ̴ 0.3 mm Properties • Steel parts Isolid=24 (with Isolid=1, to much Hourglassenergy) • Concrete parts must have Isolid=1 (with Isolid=24, to much damping)
  10. 10. 10 Definition of design variables/ Specifications 7 Design variables • fc (Concrete uniaxial compression strength) • ft/fc (Concrete tensile strength ratio) • ν (Poisson’s ratio) • Ht (Concrete data tensile tangent modulus) • ky (Concrete plasticity initial value of hardening parameter) • Stfac Type20 Ram and Tool (Interface stiffness scale factor) • Stfac Type20 Tool Tip and Concrete Core (Interface stiffness scale factor) DOE Specifications • Hammersley • Number of runs: choose by default (36 runs)
  11. 11. 11 Definition of the responses: characteristic measures of test curve 11 Max.Distance Curvature Length Pene_max Slope Response • Maximum Penetration • Curvature Length (at a node displacement of 0.15mm) • Slope • Max. Distance (of the time axis 6e-4s until 9e-4s) • Ram velocity at the end
  12. 12. 12 DOE Results 12 Max.Distance Curvature Length Pene_max Slope Curvature Length Slope Max. Distance Ram V_end Pene_Max Curvature Length Stfac _Ram_Tool Max. Distance RamV_end Pene_Max Ht fc Stfac _Tip_Core ft/fc ky Poisson’s ratio Slope
  13. 13. 13 DOE Results / Optimization 13 Optimization Design variables • fc (Concrete uniaxial compression strength) • ft/fc (Concrete tensile strength ratio) •Stfac Type20 Ram and Tool (Interface stiffness scale factor) • Stfac Type20 Tool Tip and Concrete Core (Interface stiffness scale factor) Optimization Specification • Genetic Algorithm Statistical Reference Curve Start Values For Optimization DOE Result Curves
  14. 14. 14 Optimization Result
  15. 15. 15 Thanks for Your Attention!

×