共查询到16条相似文献,搜索用时 78 毫秒
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Measurement of Very Slow Crack Growth in Glass 总被引:1,自引:0,他引:1
The rate of very slow crack growth in glass is measured by inducing small, controllable changes in the direction of propagation of Hertzian cone cracks at known times. After completion of a growth sequence, the sample is sectioned to reveal the fracture surface. The stress intensity factor at each stage of crack growth is calculated by using finite-element modeling of the stresses near the crack tip. Data are presented for crack growth velocities as low as 10−14 m/s in soda–lime glass. These data provide strong evidence for the existence of a subcritical limit for crack growth in this material. 相似文献
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磷酸盐激光玻璃在干燥和潮湿空气下的磨损性能 总被引:1,自引:0,他引:1
在往复式摩擦磨损试验机上采用石英玻璃球作为对摩副,研究了干燥和潮湿空气下磷酸盐激光玻璃的磨损性能。结果表明:磷酸盐激光玻璃在潮湿空气下比干燥空气下表现出更好的耐磨性,应力腐蚀几乎不能促进该玻璃的材料去除。此外,低载磨损时磷酸盐激光玻璃在潮湿空气中比干燥空气中更容易出现Hertz裂纹,然而高载下该玻璃表面的Hertz裂纹在潮湿空气中却表现得更为轻微。与磷酸盐玻璃相反,石英玻璃球在潮湿空气下的磨损程度远高于干燥空气下,应力腐蚀对潮湿空气下石英玻璃球的磨损起到了主导作用。 相似文献
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A transparent self‐healing coating incorporating chambers and capsules capable of preventing the propagation of cracks in glass is presented. The main features simultaneously satisfy the requirements of high transmittance (≈90% in the visible region) and the ability to heal random and large‐area cracks in coated‐glass materials (up to 6 cm long, 20 µm wide, and 1 mm deep per chamber). Additionally, the polymerized hydrogel used as the healing agent can stop crack propagation because of its high mechanical strength and good adhesion to glass. Remarkably, the healed glass can withstand a force approximately four times greater than what can be withstood by the unhealed glass after cracking. 相似文献