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首页> 外文期刊>Journal of thermal stresses >FAILURE-MODE TRANSITION SPEED IN THREE-DIMENSIONAL TRANSIENT DEFORMATIONS OF A MICROPOROUS HEAT-CONDUCTING THERMOELASTOVISCOPLASTIC PRENOTCHED PLATE
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FAILURE-MODE TRANSITION SPEED IN THREE-DIMENSIONAL TRANSIENT DEFORMATIONS OF A MICROPOROUS HEAT-CONDUCTING THERMOELASTOVISCOPLASTIC PRENOTCHED PLATE

机译：微孔导热热塑粘弹塑性预应力板三维瞬态变形中的失效模式转变

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摘要

We analyze three-dimensional finite coupled thermomechanical deformations of a rectangular plate with two parallel notches placed symmetrically about the horizontal centroidal plane of the plate. The edge surface of the plate between the two notches is struck by a cylindrical projectile of diameter equal to the distance between the notches and made of the same material as the plate. The plate material is modeled as heat-conducting, microporous, elastoviscoplastic, and isotropic. Both the brittle and the ductile failures initiate at points adjoining the notch-tip surface that are on the midplane of the plate and propagate toward the outer surfaces. Even for a relatively thin plate, the difference in the times of initiation of failures on the mid and front surfaces is significant. Also the two failure modes on the mid surface initiate much later than that predicted by the plane strain analysis. Thus an experimentalist observing fracture on the front or the back face of the plate will see it initiate much later than the times given by the plane strain analysis of the problem. For a steel plate, it is found that the failure mode transitions from brittle to ductile at an impact speed of about 21.8 m/s.
机译：我们分析了矩形板的三维有限耦合热机械变形，其中两个平行的槽口对称于板的水平质心平面放置。两个凹口之间的板的边缘表面被直径等于凹口之间的距离的圆柱形弹丸击中，并且该弹丸由与板相同的材料制成。板材料被建模为导热，微孔，弹性粘塑性和各向同性。脆性破坏和延性破坏都在与缺口尖端表面相邻的点处开始，这些点位于板的中平面上并向外表面传播。即使对于相对薄的板，在中表面和前表面上引发故障的时间差异也很大。而且，中表面上的两种破坏模式的产生要比平面应变分析预测的要晚得多。因此，观察板的正面或背面断裂的实验人员将看到，它的产生比问题的平面应变分析所给出的时间晚得多。对于钢板，发现破坏模式在约21.8 m / s的冲击速度下从脆性转变为延性。

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