TAILIEUCHUNG - Mechanics Analysis Composite Materials Episode 11

Tham khảo tài liệu 'mechanics analysis composite materials episode 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 336 Mechanics and analysis of composite materials Fig. . Calculated lines and experimental circles dependencies of dissipation factor on the ply orientation for glass-epoxy --- and carbon-epoxy ----o unidirectional composites. Dependence of an aramid-epoxy composite material temperature on the number of cycles under tensile and compressive loading with frequency 103 cycles per minute is shown in Fig. Tamuzh and Protasov 1986 . Under cyclic loading structural materials experience a fatigue fracture caused by material damage accumulation. As was already noted in Section heterogeneous structure of composite materials provides relatively high resistance of these materials to crack propagation resulting in their specific behavior under cyclic loading. As follows from Fig. showing experimental results obtained by . Kutinov stress concentration in aluminum specimens practically does not affect material static strength due to plasticity of aluminum but dramatically reduces its fatigue strength. Conversely static strength of carbon-epoxy composites that Fig. . Temperature of an aramid-epoxy composite as a function of the number of cycles under tension 1 and compression 2 . Chapter 7. Environmental special loading and manufacturing effects 337 Fig. . Typical fatigue diagrams for carbon-epoxy composite solid lines and aluminum alloy broken lines specimens without 1 and with 2 stress concentration fatigue strength is normalized to static strength of specimens without stress concentration . belong to brittle materials is reduced by stress concentration that practically does not affect the slope of the fatigue curve. On average residual strength of carbon composites after 106 loading cycles makes 70-80 of material static strength in comparison with 30 40 for aluminum alloys. Qualitatively this comparative evaluation is true for all fibrous composites that are widely used in structural elements subjected to intensive vibrations such as helicopter .

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