Previous studies have shown that cemented tungsten carbides undergo a significant loss of shear strength when shock compressed to longitudinal stresses greater than ~ 30 GPa. In the present study, interface particle velocity profiles obtained from plate impact experiments on cemented tungsten carbides with 3.7 and 6.0 wt.% cobalt binder are analyzed to obtain longitudinal stress versus engineering strain relationships along the shock loading paths by integrating the differential relations between the measured stress and the measured particle velocity increments. The resulting stress versus strain curves are compared with hydrostatic/hydrodynamic pressure profiles, to gain insights into the dynamic strength of the shocked samples to ~ 100 GPa. The shear stress supported by the cemented tungsten carbide samples increase with engineering strain until a maximum in shear stress is reached, after which it decreases quickly with further compression. The maximum shear stress increases from ~ 4 to 9 GPa with an increase in the peak longitudinal stress from 8 to 92 GPa, suggesting significant pressure hardening in the cemented tungsten carbides at longitudinal stresses above their Hugoniot elastic limit.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Dynamic Strength of Cemented Tungsten Carbides Under Shock Loading

  • Bingsen Wang,
  • Vikas Prakash

摘要

Previous studies have shown that cemented tungsten carbides undergo a significant loss of shear strength when shock compressed to longitudinal stresses greater than ~ 30 GPa. In the present study, interface particle velocity profiles obtained from plate impact experiments on cemented tungsten carbides with 3.7 and 6.0 wt.% cobalt binder are analyzed to obtain longitudinal stress versus engineering strain relationships along the shock loading paths by integrating the differential relations between the measured stress and the measured particle velocity increments. The resulting stress versus strain curves are compared with hydrostatic/hydrodynamic pressure profiles, to gain insights into the dynamic strength of the shocked samples to ~ 100 GPa. The shear stress supported by the cemented tungsten carbide samples increase with engineering strain until a maximum in shear stress is reached, after which it decreases quickly with further compression. The maximum shear stress increases from ~ 4 to 9 GPa with an increase in the peak longitudinal stress from 8 to 92 GPa, suggesting significant pressure hardening in the cemented tungsten carbides at longitudinal stresses above their Hugoniot elastic limit.