摘要
应用应变梯度塑性理论来表示高速切削绝热剪切现象,提出绝热剪切带的应变和应变梯度的分布模型,分析了材料的内禀长度对应变及应变梯度的影响.分析结果表明:剪切应变在绝热剪切带中心达到最大值,在两边界线应变达到最小或零;应变梯度在绝热剪切带中心达到最小或零,在两边界线达到最小或零.当材料的内禀长度越大时,绝热剪切应变变化越小越缓慢,应变梯度变化越大.
The strain gradient plasticity theory was used to explain the adiabatic shear bands during the high speed cutting processes. The distribution model of strain and strain gradient was proposed. The effect of intrinsic length scale on the strain and strain gradient distribution was analyzed. The results show that the shear strain is maximum in the central line of adiabatic shear bands;the shear strain is minimum or zero on the both boundary lines. The strain gradient is zero at the central line and both boundary of the adiabatic shear bands. The strain gradient is maximum at the central line of the central line and boundary of the primary deformation zone. When the intrinsic length scale increases, the shear strain varies less, and the strain gradient changes more.
出处
《绍兴文理学院学报》
2014年第10期9-13,共5页
Journal of Shaoxing University
关键词
应变梯度
绝热剪切
高速切削
应变率
strain gradient
adiabatic shear
high speed cutting
strain rate
