1. Introduction Experimentation
Test Equipment
• MTS Criterion Model 45 testing machine
• Short beam shear fixture (ASTM D2344)
Sample Dimensions:
• Specimen length(L)=Thickness(T)x6
• Specimen width(B)=Thickness(T)x2
Short beam strength
Fsbs = 0.75 ∗
𝑃
𝐵∗𝑇
where, Fsbs = short beam shear strength, psi ;
P = maximum observed load, lbf ;
• In the aerospace industry the field repair of composite parts
are accomplished by adhesively bonding a soft patch (uncured
prepreg) or a hard patch (cured prepreg) to the damaged area
using a heat blanket enclosed by a vacuum bag.
Cases of study
a) Co-curing of two uncured laminates with an adhesive film
(baseline)
b) Co-curing of a uncured laminate (soft patch) and adhesive
layer on top of a cured parent laminate
c) Co-curing of a cured (hard patch) and adhesive layer on top of
a cured parent laminate.
Materials and Panel Fabrication
Results
Causes of Childhood obesity
Conclusion
• SBS strength of hard patch is greater than that of the soft
patch.
• In most cases SBS strength increases with increase in post-
cure temperature except for in hard patch repair.
• SBS strength of laminate without adhesive is more than that
which was co-cured with adhesive.
• SBS strength of soft patch is greater than that of laminate co-
cured with adhesive.
• Adhesive film is least affected by post-cure temperature
variation.
• Mechanical properties of soft patch repair observed to be better
than the laminate co-cured with adhesive.
• Decrease in mechanical properties by introducing adhesive film
in the mid plane of uncured laminates
Female
Materials
• Cytec Cycom 5320-1 8 harness satin carbon fiber
• Cytec FM 300-2M film adhesive
Vacuum bagging scheme and layup
• Prepreg stacking direction = [0⁰]10
Cure cycle used to cure the specimen
EFFECT OF POST-CURING TEMPERATURE VARIATION ON MECHANICAL
PROPERTIES OFADHESIVELY BONDED COMPOSITE LAMINATES
Manoj T. Krishnamaraja, S. Soltani, Akhil Bhasin, A. Sriyarathne
Faculty: Dr. Suresh Keshavanarayana Raju
Department of Aerospace Engineering, College of Engineering, Wichita State University
Observation
Sample observation at failure
Microscopic images of failed samples
Without adhesive Case (a) Case (b) Case (c)
Without adhesive
Case (a)
Case (b)
Case (c)
a. Graphical comparison of average SBS strength
b. ANOVA analysis of SBS strength
Adhesive film
Adhesive film
Adhesive film