Specimen cracking in a controlled environment is an essential characteristic that is challenging to capture in indirect tensile testing methodologies, including the Brazilian disc test and Ring test. Despite wide popularity, these experiments are incapable of acquiring the actual post-peak behavior and complete load versus displacement response when both load and displacement reversals occur. It is due to the excess strain energy beyond the dissipation capacity of the specimen's center crack, where stress reaches the threshold first, leading to violent dynamic responses that cannot be stabilized using direct displacement control. This study presents the applications of an innovative methodology, named AUSBIT (Adelaide University Snap-Back Indirect Tensile test), to stabilize the disc cracking under diametrical compression, using indirect lateral displacement control. The AUSBIT enables us to capture the complete load versus displacement response exhibiting snapback (or class-II), facilitating the analysis of strain energy and dissipation behind the observed snapback behavior. Brazilian disc tests using the AUSBIT were performed successfully on concrete and various rocks, including Hawkesbury sandstone, Iranian Granite, and Bluestone. Acoustic emission (AE) and Digital Image Correlation (DIC) techniques were used to assess the effectiveness of AUSBIT in controlling the localized dynamics. Using this test method, the intrinsic mechanism of strain energy evolution and its influence on the overall snapback behavior, along with the influence of specimen size and material types, can be analyzed with reliable data excluding the dynamic effects.

样品在受控环境中开裂是一个基本特征，在间接拉伸测试方法中很难捕捉到，包括巴西圆盘测试和环测试。尽管广受欢迎，但当负载和位移都发生反转时，这些实验无法获得实际的峰值后行为和完整的负载与位移响应。这是由于过度应变能超出了试样中心裂纹的耗散能力，应力首先达到阈值，导致无法使用直接位移控制稳定的剧烈动态响应。本研究介绍了一种名为 AUSBIT（阿德莱德大学回弹间接拉伸测试）的创新方法的应用。)，使用间接横向位移控制来稳定径向压缩下的圆盘开裂。AUSBIT 使我们能够捕获显示回弹（或 II 类）的完整负载与位移响应，促进对观察到的回弹行为背后的应变能和耗散的分析。使用 AUSBIT 的巴西圆盘测试在混凝土和各种岩石上成功进行，包括霍克斯伯里砂岩、伊朗花岗岩，和青石。声发射 (AE) 和数字图像相关 (DIC) 技术用于评估 AUSBIT 在控制局部动力学方面的有效性。使用这种测试方法，可以用可靠的数据分析应变能演化的内在机制及其对整体回弹行为的影响，以及试样尺寸和材料类型的影响，排除动态效应。