Knowledge of the damage resistance and damage tolerance properties of a laminated composite plate is useful for product development and material selection. The residual resistance data obtained by this test method will be used in the specification of materials and research and development. The properties obtained using this method will provide a guide about the capacity for tolerance to the…
This test method is designed to produce notched compressive strength data for structural design allowables, material specifications, research and development, and quality assurance. Factors that influence the notched compressive strength and shall therefore be reported include the following: material, methods of material fabrication, accuracy of lay-up, laminate stacking sequence and overall thickness, specimen geometry, (including hole diameter, diameter-to-thickness ratio, and…
The untabbed sample is 3 “long, 1” wide, and the thickness can vary depending on the material and layup in the testing phase. Northrop Specification recommended thicknesses from 0.125 “to 0.250”. The standard sample contains a central “diameter hole 0.25, even if the unit has proved effective, even for compression of specimens without holes, if end crushing does not occur.…
This common method in aerospace concerns compression tests on plates, rolled experimentation multidirectionaldetermination of the post-impact compressive strength. The methodis also useful for the compression tests after impact on composite materials, the company has acquired a new realization of controlled impact machine. The impact receiving sample is placed in the test assembly and after the application of the load of…
This type of NASA compression after impact (CAI) of compression of the test device is an alternative to the more popular Boeing compression after the compression of the device of the impact test. The NASA devices are 10 ” long and 5″ in width. As in Boeing method, a quasi-isotropic laminate is typically tested. The NASA device version includes four…
