相关实验视频
Updated: Jan 12, 2026

08:36
Fragility Assessment of Bovine Cortical Bone Using Scratch Tests
Published on: November 30, 2017
9.9K
基于AE的分类和破裂过程分析有缺陷的大理石与应力强度因子验证
Peng Sha1,2, Jiakang Fan3, You Lv3
1Zhejiang Key Laboratory of Rock Mechanics and Geohazards, School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China. shapeng@usx.edu.cn.
Scientific reports
|November 3, 2025
概括
本研究引入了用于大理石裂分析的新声辐射 (AE) 分类标准. 这种方法准确地区分了拉力和剪切裂,改善了岩石稳定性的预测.
科学领域:
- 地质技术工程 地质技术工程
- 岩石力学 岩石力学 岩石力学
- 材料科学 材料科学 材料科学
背景情况:
- 岩石质量的稳定性受到先前存在的裂的显著影响.
- 在各种几何形状下裂演变的微机制尚未得到充分理解.
- 准确的实时裂类型歧视对于预测岩石破裂至关重要.
研究的目的:
- 为大理石开发一种新的,岩石特异性声辐射 (AE) 分类标准.
- 实时量化区分拉力和剪切裂.
- 建立一个可靠的框架,用于早期警告岩石不稳定性.
主要方法:
- 综合划痕半圆曲 (NSCB) 和直划痕巴西圆盘 (SNBD) 试验被用于建立AE分类标准.
- 声辐射 (AE) 监测与应力强度因子 (SIF) 分析相结合.
- 单轴压缩测试是在不同的裂纹倾斜度和长度的大理石样本上进行的.
主要成果:
- 建立了一个新的AE分类标准:拉力裂 (AF > 40 RA + 30) 和剪切裂 (AF < 20 RA + 30).
- 发现裂纹倾向控制了从拉伸到剪切故障的过渡.
- 观察到裂的长度加速了损伤的积累.
- 结合AE-SIF分析有效地捕获了微机械裂演变.
结论:
- 开发的AE分类标准为实时裂类型歧视提供了量化,适应材料的方法.
- 该研究成功地将微观骨折过程与宏观故障模式相结合.
- 这项研究为增强岩石不稳定性早期预警系统提供了一个强大的框架.
相关概念视频
Stress-Strain Diagram - Brittle Materials
3.8K
Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
3.8K
Microcracking in Concrete
420
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
420
Behavior of Concrete Under Compressive Load
576
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
576
Fatigue
790
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
790
Flexural Stress
676
When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
676
Stress Concentrations
608
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
608

