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首页> 外文期刊>Acta Metallurgica et Materialia >THE DUCTILE-TO-BRITTLE TRANSITION AND DUCTILE FAILURE ENVELOPES OF ORTHOTROPIC ICE UNDER BIAXIAL COMPRESSION
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THE DUCTILE-TO-BRITTLE TRANSITION AND DUCTILE FAILURE ENVELOPES OF ORTHOTROPIC ICE UNDER BIAXIAL COMPRESSION

机译:双轴压缩下正交各向异性冰的从硬质合金到硬质合金的转变和韧性破坏包络

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摘要

Experiments were performed on orthotropic columnar fresh-water ice of ≈ 6 mm column diameter proportionally loaded across the columns under biaxial compression at -10℃ under various combinations of strain rate and stress ratio, R = σ_(22)/σ_(11). The ductile-to-brittle transition strain rate increased from about 8 x 10~(-5)s~(-1) under no confinement to about 3 x 10~(-4)s~(-1) under intermediate confinement (R approx = 0.3), and then decreased to about 5 x 10~(-5)s~(-1) under full confinement (R = 1). The ductile failure envelopes are semi-elliptical in shape and conform fairly well to those created with the use of Hill's [9] criterion for the yielding of plastically orthotropic materials. The transition strain rate is rationalized in terms of the effects of the confining stress on the ductile and the brittle failure stresses, and is modelled in terms of the suppression of creep deformation at the tips of wing cracks.
机译:在应变率和应力比R =σ_(22)/σ_(11)的各种组合下,在-10℃双轴压缩下,对直径约6 mm的正交各向异性圆柱状淡水冰进行了试验。韧性到脆性的转变应变率从无限制时的约8 x 10〜(-5)s〜(-1)增加到中等限制时的约3 x 10〜(-4)s〜(-1)(R大约= 0.3),然后在完全限制(R = 1)下减小到大约5 x 10〜(-5)s〜(-1)。延性破坏包络线是半椭圆形的,并且与使用Hill [9]准则产生的塑性正交异性材料所产生的包络性相当好。根据限制应力对延性和脆性破坏应力的影响合理化了过渡应变率,并根据抑制机翼裂纹尖端的蠕变变形建模。

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