...JR Reeder The mixed-mode bending (MMB) test for delamination toughness was first introduced in 1988. This simple test is a combination of the standard Mode I (opening) test and a Model II (sliding) test. This MMB test has become widely used in the United States and around the world for mixed-mode...

...R Krueger; IL Paris; TK O’Brien; PJ Minguet A methodology is presented for determining the fatigue life of composite structures based on fatigue characterization data and geometric nonlinear finite element analyses. To demonstrate the approach, predicted results were compared to fatigue tests...

...R Krueger; IL Paris; TK O’Brien; PJ Minguet A methodology is presented for determining the fatigue life of composite structures based on fatigue characterization data and geometric nonlinear finite element analyses. To demonstrate the approach, predicted results were compared to fatigue tests...

...JS Welsh; DF Adams Using a thickness-tapered cruciform specimen, uniaxial and biaxial tests were performed on 6061-T6 aluminum as well as biaxial and triaxial tests on an AS4/3501-6 carbon/epoxy cross-ply laminate. Designed in conjunction with a new triaxial test facility, the performance...

... to the phenomena of mechanical resonance and control problems that the test equipment acquires at high speeds. The amplitudes of the resulting oscillations increase with test speed and change the test sample response, making results difficult to analyze. These inertial problems may be avoided if the extrapolation...

... be sensitive to damage, for example, from repeated fastener installation and removal, or from lightning strike. Thicker inserts with a nut-anchoring feature are a cost-effective alternative to riveted nut plates currently used in composite-fastened assemblies. A comprehensive test program involving...

... lengths. KEYWORDS: adhesive joints, fracture, testing, mixed mode, energy release rate, mode ratio Nomenclature a = crack length C1 = geometry function C2 = geometry function C3 = dimensionless constant C4 = dimensionless constant CA= compliance of specimen with adhesive layer C" = compliance...

...MC Waterbury; LT Drzal A method is described and experimental results given which demonstrate the feasibility of determining fiber strengths at short gage lengths by monitoring the fiber failure process during the embedded single-fiber fragmentation test. A computerized weakest link fiber model...

... to determine the stress-strain response, the progression of failure, and ultimate tensile strengths. Testing the specimens with ply layups of [±45°] 4s and [0°/±45°/90°] 2s containing ±45° plies was complicated by the development of high strains, thereby causing the strain gages to peel off during tests. James...