A review on the fracture of brittle and quasi-brittle materials using semi-circular bend (SCB) tests

IF 6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2026-04-01 Epub Date: 2026-02-07 DOI:10.1016/j.tafmec.2026.105501

Mahinda Kuruppu , Majid R. Ayatollahi , Ken P. Chong

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Abstract

The semi-circular bend (SCB) specimen was originally suggested and developed for testing mode I fracture toughness of rock and other brittle or quasi-brittle materials. Since its introduction, the SCB test has been improved and extended for many other applications. Among them were its suitability for testing mixed mode I and II fracture that has a great deal of practical significance, its adaptability for testing dynamic fracture properties of materials and its applicability to testing a wide variety of materials including asphalt concrete mixes, polymer, nano and bio composites, additively manufactured and smart materials. Recent research findings on the use of appropriate loading and support pins, and the development of the methods to address the specimen size dependence of fracture toughness have enhanced the accuracy of test results. Methods of correction suggested by a number of researchers which enable one to determine a scale independent Mode I fracture toughness using the experimental results are discussed. Following the development of ISRM suggested method for fracture toughness determination of rock materials using the SCB specimen in 2014, four other standards including ASTM to determine the fracture toughness and other related properties of asphalt concrete were developed and their advantages and limitations are discussed.

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半圆弯曲试验对脆性和准脆性材料断裂的研究进展

半圆弯曲（SCB）试样最初是为测试岩石和其他脆性或准脆性材料的I型断裂韧性而提出和发展的。自推出以来，SCB测试已经得到了改进和扩展，适用于许多其他应用。其中，适合于测试具有重要实际意义的I型和II型混合断裂，适合于测试材料的动态断裂性能，适用于测试沥青混凝土混合料、聚合物、纳米和生物复合材料、增材制造和智能材料等多种材料。近年来，在使用合适的加载和支撑销方面的研究成果，以及解决断裂韧性对试样尺寸依赖的方法的发展，提高了测试结果的准确性。讨论了一些研究人员提出的校正方法，这些方法使人们能够根据实验结果确定与尺度无关的I型断裂韧性。继2014年ISRM建议的用SCB试样测定岩石材料断裂韧性的方法发展之后，又发展了ASTM等测定沥青混凝土断裂韧性等相关性能的四个标准，并讨论了它们的优点和局限性。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.