Size scaling of tensile failure stress in boron carbide

作者：Wereszczak A A^*; Kirkland T P; Strong K T Jr; Jadaan O M; Thompson G A

来源：Advances in Applied Ceramics, 2010, 109(8): 487-492.

DOI：10.1179/174367510X12677121374546

• Boron carbide
• Weibull
• Strength
• Strength scaling

Weibull strength size scaling in a rotary ground, hot pressed boron carbide is described when strength test coupons sampled effective areas from very small (similar to 0.001 mm(2)) to very large (similar to 40 000 mm(2)). The testing of this ceramic is relevant because it is a candidate material for use in personnel armour. Equibiaxial flexure and Hertzian testing were used for the strength testing. Characteristic strengths for several different specimen geometries are analysed as a function of effective area. Characteristic strength was found to substantially increase with decreased effective area and exhibited a bilinear relationship. Machining damage limited strength as measured with equibiaxial flexure testing for effective areas greater than similar to 1 mm(2), and microstructural scale flaws limited strength for effective areas, <0.1 mm(2) for the Hertzian testing. The selections of a ceramic strength to account for ballistically induced tile deflection and expanding cavity modelling are uniquely considered in context with the measured strength size scaling.

• 出版日期2010-11