Anisotropy of the low-cycle tensile fatigue strength and deformability of a glass-reinforced plastic
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Experimental results on the anisotropy of the strength and deformability of a 1:1 SVAM oriented glass-reinforced plastic in low-cycle tension in the directions ϕ=0, 15, 30, and 45° are discussed. The loading frequency was 1–1.5 cycles/minute. A three-dimensional fatigue strength diagram is constructed in σmax - ϕ - log N coordinates. It is shown that in the direction ϕ=0° the fracture strain depends on stress, whereas at ϕ≠0° the glass-reinforced plastic fails at almost the same maximum strain, the value of which depends on ϕ, but is invariant with respect to σmax. It is established that the rate of development of the strain extrema on the linear part of the ɛ (N) graph and the stress σmax are related by a power-law dependence, whose parameters are determined by the anisotropy of the mechanical properties of the composite.
KeywordsFatigue Mechanical Property Anisotropy Fatigue Strength Linear Part
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