Guan Xiqiang, Huang Baofeng, Li Zhan, Ma Xiaofeng, Liang Benliang
College of Information, Mechanical and Electrical Engineering, Shanghai Normal University, Shanghai 201418, China.
College of Civil Engineering, Shanghai Normal University, Shanghai 201418, China.
Materials (Basel). 2023 Apr 28;16(9):3440. doi: 10.3390/ma16093440.
Sandstone is widely used a construction and building material. However, its uniaxial tensile strength (UTS) is not adequately understood. To characterize the uniaxial tensile strength of natural sandstone, three groups of specimens were fabricated for four-point bending, uniaxial compressive, and tensile tests. To characterize the evolution of the stress-strain profiles obtained via these tests, representative expressions were developed in terms of normalized strain and strength. The magnitude of the uniaxial tensile strength exceeded that of the four-point bending strength, indicating that the uniaxial tensile strength cannot be represented by the four-point bending strength. The experimental ratio of uniaxial tensile and compression strength (33-41) was underestimated by the empirical expressions reported in the literature. The suggested correction coefficient for the FBS is 0.25. The compressive modulus () was generally identical to the experimental results published in the literature, whereas the tensile modulus () was overestimated. The experimental modular ratio, /, ranged from 0.12 to 0.14; it was not sensitive to Poisson's ratio, but it increased slightly with the compressive modulus. This work can serve as a reference for computing the load-bearing capacity of sandstone components under tension.
砂岩被广泛用作建筑和建材。然而，其单轴抗拉强度（UTS）尚未得到充分了解。为了表征天然砂岩的单轴抗拉强度，制备了三组试样用于四点弯曲、单轴压缩和拉伸试验。为了表征通过这些试验获得的应力-应变曲线的演变，根据归一化应变和强度建立了代表性表达式。单轴抗拉强度的大小超过了四点弯曲强度，这表明单轴抗拉强度不能用四点弯曲强度来表示。文献报道的经验表达式低估了单轴抗拉强度与抗压强度的实验比值（33 - 41）。建议的四点弯曲强度修正系数为0.25。压缩模量（）通常与文献中公布的实验结果一致，而拉伸模量（）则被高估。实验模量比，/，范围为0.12至0.14；它对泊松比不敏感，但随压缩模量略有增加。这项工作可为计算砂岩构件在拉伸状态下的承载能力提供参考。
