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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Influence of crack geometry and loading mode on fracture and fatigue of soda-lime-silica glass
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Influence of crack geometry and loading mode on fracture and fatigue of soda-lime-silica glass

机译：裂纹几何形状和加载方式对钠钙硅玻璃断裂和疲劳的影响

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Fracture toughness and cyclic fatigue resistance of sodalime-silica glass in water environments are studied in this work.Novel sandwiched beam(SB)specimens are used to measure the fracture toughness in mode I,model II and mixed mode loading.Both SB samples and Vickers indented bars are used for the analysis of cyclic fatigue resistance in mode I and II.Values of K_ic=0.74 MPam~1//2 and K_IIC=0.64 MPam~1/2 were obtained.Results for mixed mode fracture show that failure in soda-lime-silica glass can be described by the maximum normal stress criterion.Therefore,defect propagation is controlled by the near crack tip stress field.Cyclie fatigue tests furnish similar results for the crack geometry in mode I loading.Comparison of experimental results with predictions based on the typical power lay for sub-critical crack growth in glass shows that cyclic fatigue resistance is also related to the typical stress corrosion mechanism for glasses in contact with a humid environment resulting in lifetime becoming longer under alternating loads(R=-1)than under pulsed stress(R-O).Cyclic fatigue resistance is also larger under moder II than under mode I.Fractographic analysis of samples subjected to cyclic loads shows that crack propagation driven by an oscillating load is characterised by rib marks attributed to arrest of the crack front when the load decreases below zero or below the fatigue limit in each cycle.
机译：本文研究了钠钙硅玻璃在水环境下的断裂韧性和抗循环疲劳性能。使用新颖的夹层梁（SB）样品测量了I，II型和混合模式载荷下的断裂韧性.SB样品和维氏硬度压痕棒用于分析模式I和II中的循环疲劳强度，得出K_ic = 0.74 MPam〜1 // 2和K_IIC = 0.64 MPam〜1/2的值。混合模式断裂的结果表明，苏打水的破坏石灰硅玻璃可以用最大法向应力准则来描述。因此，缺陷的传播受裂纹尖端应力场的控制。循环疲劳试验对I型载荷下的裂纹几何形状提供了相似的结果。实验结果与预测结果的比较基于玻璃次临界裂纹增长的典型功率分布，表明循环疲劳强度还与玻璃接触潮湿环境导致起伏的典型应力腐蚀机理有关。在交变载荷（R = -1）下，etime比在脉冲应力（RO）下更长。在现代II下，循环疲劳强度也比在模式I下更大。对循环载荷的样品进行分形分析表明，裂纹是由振动驱动的载荷的特征是在每个循环中载荷降低到零以下或疲劳极限以下时，肋痕被归因于裂纹前沿的阻止。

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