Figure 4
Tensile strength and strength retention rate of 2.5DWC with/ without a center hole as a function of temperature and hole size. Here, the percentage represents the strength retention rate, which can be calculated as \(\left. {\sigma_{u}^{{}} } \right|_{T} /\left. {\sigma_{u}^{{}} } \right|_{{T = T_{0} }}\), where \(\left. {\sigma_{u}^{{}} } \right|_{{T{ = }T_{0} }}\) and \(\left. {\sigma_{u}^{{}} } \right|_{T}\) mean the room and elevated strengths for the samples with the same hole sizes.
