501 一方向CFRP積層板の高温における非主軸繰返しクリープ回復挙動とその解析(OS-5A 複合材料・多孔質体・鉛の解析,OS-5 材料の塑性挙動の構成式のモデル化とシミュレーション)

概要

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Effects of loading history on the creep strain recovery behavior of unidirectional carbon/epoxy composites under stress-free conditions at high temperature are examined. To observe the creep strain recovery upon complete unloading just after a single off-axis loading of virgin specimens, creep tests are first performed for five hours on plain coupon specimens with various fiber orientations: θ=10, 15, 30, 45°. Creep strain recovery responses are clearly observed in all kinds of off-axis fiber orientations tested. The creep strain recovery rate tends to vanish as the axial strain decreases. A part of the axial strain developed by the prior single loading eventually remains, which indicates that a certain amount of inelastic component has been involved by the total strain due to the prior load. Then, to elucidate the effects of loading history on the off-axis creep strain recovery behavior, the cyclic recovery tests with intermittent stressing are performed at the same test conditions. The test results reveal that the amount of the off-axis creep strain recovery of the unidirectional system is governed by the age hardening of the matrix material and it is also affected by a softening due to cyclic loading.
一般社団法人日本機械学会の論文
2005-11-17