Issued as final reportLockheed Martin Aeronautic

Engelstad, Steve

Haj-Ali, Rami M.

Johnson, Shane Miguel

Kim, Hoan-Kee

Koon, Robert W.

Scholarly Materials And Research @ Georgia Tech

Damage and Failure Initiation in Lap Shear Tests Failure Initiation in Lap Shears Dr. Rami Haj-Ali, Hoan-Kee Kim, and Shane Johnson School of Civil Engineering Structural Engineering, Mechanics, and Materials Group Georgia l nstitute of Technology Atlanta, GA 30332-0355 rami.hai-aIi@ce.gatech.edu Rober W. Koon and Dr. Steve Engelstad Lockheed Martin Aeronautics Company Dept: 6E7M, Mail Zone: 0663 86 So. Cobb Drive Marietta, GA 30063-0336 Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure lnitiation in Lap Shear Tests Content 0 Objectives 0 Testing Techniques and Procedures 0 IR-Thermography 0 Acoustic Emission (AE) 0 Test methods and results - lnfrared Thermography (a) - Clip gage & AE - Strain gage - lnfrared Thermography (b) for damage lnitiation 0 Discussion Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests Objectives Perform repeated tests on four different single lap shear specimens to identify damage initiation and limit loads using different testing methods. The overall goal is to try if the proposed testing methods can identify the earliest measurable event associated with failure in single lap shear specimens. Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia z x  Damage and Failure Initiation in Lap Shear Tests Test matrix for GA Tech lap shear testing Total 20 Samples - 5 samples with 4 different cases. Fabric - woven, Tape is Quasi Isotropic laminate. Long and Standard (short) length bond. Bond Length Long (-5") Standard (-1 ") Notation: The four different samples are referred to as: UL#, US#, WL#, and WS# Where: U - Unitape; W - Woven; L - Long bond; S - Standard (short) bond; and # is a number between 1 to 5. Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Layup Fabric Tape Fabric Tape RTA 5 5 5 5 Damage and Failure Initiation in Lap Shear Tests 3) Strain gage test results (114) Unitape Long specimen UL4 0.000% 0.005% 0.010% 0.015% 0.020% 0.025% 0.030% 0.035% 0.040% Strain Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 3) Strain gage test results (214) Woven Long specimen WL5 0.000% 0.010% 0.020% 0.030% 0.040% 0.050% 0.060% Strain Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia o x  - .  Damage and Failure Initiation in Lap Shear Tests 3) Strain gage test results (314) Woven Short specimen WS1 0.7 1 0.000% 0.005% 0.01 0% 0.01 5% 0.020% 0.025% 0.030% 0.035% Strain Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 3) Strain gage test results (414) Unitape Short specimen US1 0.7 0.000% 0.005% 0.010% 0.015% 0.020% 0.025% 0.030% Strain Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 4) AE test results for US1 Load (I b) Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 4) AE test results for US4 -- Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia QeorgSan-~'lj;~ : imv- c l ~ f  i ~ i c l n - l ~ p ~ 2 ~  Damage and Failure lnitiation in Lap Shear Tests 4) AE test results for US5 0-1700 1700-1800 1800-1900 1900-2000 2000-2200 2100-2200 Load (lb) Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 4) AE test results for WS1 4 000-1200 1200-1 400 1400-1 600 1 600- 1 70.0 Load (I b) Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 4) AE test results for WS4 Load fib) - - - --- -- - Composite Affordability Initiative -- Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 4) IR-Thermography (b) test results for UL4 Load (Ib) Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia =\ Damage and Failure Initiation in Lap Shear Tests 4) AE test results for WL4 800-1 000 1000-1 200 Load (Ib) Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia Damage and Failure Initiation in Lap Shear Tests 4) AE test results for WL5 Load (lb) Composite Affordability Initiative Jan 19,2005, Atlanta, Georgia 

Damage and Failure Initiation in Lap Shear Tests

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Damage and Failure Initiation in Lap Shear Tests

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