The Conversion of Plastic Work to Heat Around a Dynamically Propagating Crack in Metals

The Conversion of Plastic Work to Heat Around a Dynamically Propagating Crack in Metals
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金属动态扩展裂纹周围的塑性功转化为热量

DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
G. Ravichandran
G. Ravichandran
中科院分区：
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文献类型：
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作者：
A. Rosakis;J. Mason;G. Ravichandran

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动态扩展裂纹温升的研究 据报道，尖端使用红外探测器阵列。此外，还测量了 使用分体式霍普金森杆装置将塑性功转化为热量的比例 结合红外探测器阵列进行了总结。适用于4340钢 可以看出，约 85% 的塑性功转化为热量，从而导致 钢中裂纹尖端以 600 m/s 的速度传播时温升为 300°C。这个 结果与早期研究报告的温度升高 450°C 进行了比较 钢中裂纹尖端扩展速度为 900 m/s。钛合金中的温升 对于相同的塑性加工率密度，其比钢更高。条件为 裂纹尖端被证明是绝热的，因此，这种效应是由于 密度、热容和裂纹尖端速度的差异。导热系数有 没有效果。
Investigations of the temperature rise at a dynamically propagating crack tip using an infrared detector array are reported. Also, a measurement of the fraction of plastic work converted to heat using a split hopkinson bar apparatus in conjunction with an infrared detector array is summarized. For 4340 steel it is seen that ≈85% of the plastic work is converted to heat leading to a temperature rise of 300°C at a crack tip propagating 600 m/s in steel. This results is compared to earlier studies that report a 450°C temperature rise at a crack tip propagating 900 m/s in steel. In a titanium alloy the temperature rise is higher than that in steel for equal plastic work rate densities. The conditions at the crack tip are shown to be adiabatic, and, as a result, this effect is due to the difference in density, heat capacity and crack tip speed. Thermal conductivity has no effect.