SINGULAR PLASTIC FIELDS IN STEADY PENETRATION OF A RIGID CONE
SINGULAR PLASTIC FIELDS IN STEADY PENETRATION OF A RIGID CONE
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DOI：
10.1115/1.2894032
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发表时间：
1992-12-01
影响因子：
2.6
通讯作者：
FLECK, NA
中科院分区：
文献类型：
--
作者：
DURBAN, D;FLECK, NA
研究了刚性/完全塑性固体穿透刚性锥体尖端活动塑性区的基本特征。对塑性区提出了精确解。刚性区存在于锥体的前方，由一个不连续的锥形面与塑性区分开。假设材料通过在刚性/塑性界面上经历“剪切冲击”而瞬间屈服。界面的方向是由剪切冲击时最小剪切应变跳变的特殊要求决定的。给出了不同锥角和摩擦系数下的结果。塑性区内的应力呈对数奇点，其水平随锥角和壁面摩擦力的增大而增大。
The essential features of the active plastic zone at the tip of a penetrating rigid cone are investigated for a rigid/perfectly plastic solid. A n exact solution is suggested for the plastic zone. A rigid zone exists ahead of the cone and is separated from the plastic zone by a conical surface of discontinuity. It is assumed that the material yields instantaneously by going through a ''shear shock'' across the rigid/plastic interface. The orientation of the interface is determined by an ad hoc requirement for minimum shear strain jump at the shear shock. Results are presented for different cone angles and friction factors. The stresses within the plastic zone admit a logarithmic singularity whose level increases with cone angle and wall friction.