復合材料의 破壞力學(6) : Simulation 疲勞試驗 Simulation Fatigue Tests = Fracture Mechanics of Composite Materials(6)

다국어 초록 (Multilingual Abstract)

Significant features of fracture problems on composite materials including bonded dissimilar materials were picked up and analyzed by the Linear Elastic Fracture Mechanics techniques in the previous papers. Mechanical and mathematical properties at the discontinuous interfaces of bonded dissimilar materials are remained still unknown as far as these are concerning to the determination of stress intensity factors which are known are known essential to the analyses of fracture problems around the interfaces.
In the present study technical simulation fatigue tests are attempted by using homogeneous plate specimens having various thickness in each ones. Several conclusions are derived as follows:
(1) Basically the simulation fatigue tests are useful to investigate fatigue fracture problems around the bonded interfaces of dissimilar materials, and also useful to estimate the varying behaviors of stress intensity factors around the discontinuous bonded interfaces.
(2) With the specimens, L-S type and S-L type, fatigue crack growing behaviors around the bonded interfaces of dissimilar materials are simulated by making specimen thickness ratio t_A/t_B equal to the ratio of elastic moduli of bonded dissimilar materials.