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摘要$ I* i$ [' o% D7 K& [+ m' M
转化是来自在一个材料样本和结构逐步减少机械阻力的过程，这是粘土砖、砂浆、石材等准脆性材料具体到一个渐进过程的显著特点。其破坏的原因是内部裂纹的增长。由于缺陷和空洞的存在，这些特性通常材料的异质性。在混凝土中，拉伸破坏现象已得到确定，但是这种破坏很少存在粘土砖中。在目前的论文中，米尼奥大学进行了一系列拉伸试验，改试验还包括三个不同类型砖的单轴拉伸。这三种试验保过抗拉强度、断裂能量的量化和实用价值采纳的建议。" ]2 ?$ i, t- c: \+ z$ e7 |. ~
BSTRACT/ N) X: U# f* }1 t$ m
Softening is a gradual decrease of mechanical resistanceresulting from a continuous increase of deformation imposedon a material specimen or structure. It is a salient feature ofquasi-brittlematerials like clay brick, mortar, ceramics, stoneor concrete which fail due to a process of progressiveInternal crack growth. Such mechanical behaviour iscommonly attributed to the heterogeneity of the material,due to the presence of different phases and materialdefects, such as flaws and voids. For tensile failure thisphenomenon has been well identified for concrete but veryfew results exists for clay brick.. In the present paper, theresults of an extensive set of tests carried out at Universityof Minho and including three different types of back underniaxial tension will be presented. Both tensile strength andfracture energy are quantified, with recommendations for theadoption of practical values." y" Y1 x# Y0 m0 D" K0 h
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