mission.) FIGURE 10.16 物 (1.5 in)he 40 mm. plane compressive strength after delamination due to transverse impact The problem of local buckling and the corresponding reduction of in- "backed out"of [0/90]cross-ply laminate compression test data [37]. rial.Compressive properties of the [o]unidirectional lamina can also be consisting of the neat resin matrix material instead of a honeycomb mate- specimen [36]is smaller than that used in ASTM D5467 and has a core ulus and strength have been reported in the literature.The minisandwich Anumber of alternative methods for measurement of compressive mod- shear load on the sides of the specimen can be adjusted for best results. and the ratio of direct compressive load on the ends of the specimen to the relatively simple and compact,no end tabs are required on the specimens, has several advantages over the other two methods.The CLC fixture is length of the specimen.Adams et al.[3]have suggested that the CLC method transfer through side loading to produce pure compression within the gage of direct compression on the ends of an untabbed specimen and shear compression(CLC)test.The CLC fixture (fig.10.17)involves a combination testing of composites is D6641/D6641M-01e1 [34],the combined loading The third version of the ASTM standard test methods for compression ASTM Standard D5467/D5467M-97.Copyright ASTM International.Reprinted 'with per ASTM D5467/D5467M-97 sandwich beam specimen for face sheet compression.(From Loading cylinder Core material Strain gage 1 22.0im 550mm 100mm Opposite skin 20mm0350-712000035mm +取 Test skin 200 mm Strain gage 2 (1.0 in)w 25 mm Principles of Composite Material Mechanics of statically induced or impact-induced damage. FIGURE 10.17 compressive residual strength of composite plates with various amounts 7137/D7137M-05e1.The result of this sequence of tests is data on the the specimens are subjected to in-plane compression according to ASTM D6264 or drop-weight impact damage according to ASTM D7136 and then subjected to either quasistatic indentation damage according to ASTM and the test fixture is shown in figure 10.18.First,the test specimens are strength properties of damaged polymer matrix composite plates [401 Standard D7137/D7137M-05e1 on measurement of compressive residual Still more recent work on CAI has led to the development of ASTM after impact(CAD test. about this failure mode has led to the development of the compression have been discussed in chapter 7(fig.7.39)and in chapter 9.Concern D6641M-01.Copyright ASTM International.Reprinted with permission.) Test fixture for ASTM D6641/D6641M-01 CLC test method.(From ASTM Standard D6641/ bearings screws Clamping and linear Alignment rods Specimen 48 mm (1.9 in)- Mechanical Testing of Composites and Their Constituents extensometer Kecess for (gage length) 12.7 mm (0.5 in) 64mn2.5im) 53 mm (2.1 in) 3