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首页> 外文会议>2002 ASME Pressure Vessels and Piping Conference, Aug 5-9, 2002, Vancouver, British Columbia, Canada >FRACTURE RESPONSE OF EXTERNALLY FLAWED CYLINDRICAL SHELLS TO INTERNAL GASEOUS DETONATION LOADING
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FRACTURE RESPONSE OF EXTERNALLY FLAWED CYLINDRICAL SHELLS TO INTERNAL GASEOUS DETONATION LOADING

机译：外圆圆柱壳的断裂对内部气态爆轰载荷的响应

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Experiments were performed to observe the fracture behavior of thin-wall and initially-flawed aluminum tubes to internal gaseous detonation loading. The pressure load, with speeds exceeding 2 km/s, can be characterized as a pressure peak (ranging from 2 to 6 MPa in these experiments) followed by an expansion wave. Flaws were machined as external axial surface notches. Cracks ran both in the upstream and downstream directions as the hoop stress opened up the notch. Different kinds of crack propagation behavior were observed for various loading amplitudes and flaw sizes. For low-amplitude loading and short flaws, cracks tend to run in a helical fashion, whereas for high-amplitude loading and long flaws, cracks tend to bifurcate in addition to running helically. Unless the cracks branched and traveled far enough to meet, resulting in a split tube, they were always arrested. Strain gages were used to monitor the hoop strains at several places on the tubes' external surface. Far away from the notch, tensile vibrations were measured with frequencies matching those predicted by the steady-state Tang (1965) and Simkins (1987) models. Near the notch, compressive strains were recorded as a result of the bulging at the notch. Features in the strain signals corresponding to different fracture events are analyzed.
机译：进行实验以观察薄壁铝管和最初有缺陷的铝管对内部气体爆炸载荷的断裂行为。速度超过2 km / s的压力负载可以表征为压力峰值（在这些实验中为2到6 MPa），然后是膨胀波。缺陷被加工成外部轴向槽口。当环向应力打开了缺口时，裂纹在上游和下游方向都出现了。对于各种载荷幅度和缺陷尺寸，观察到了不同种类的裂纹扩展行为。对于低振幅载荷和短裂纹，裂纹倾向于以螺旋的方式延伸，而对于高振幅载荷和长裂纹，裂纹除了螺旋延伸的以外，还有分叉的倾向。除非裂缝分支并且行进到足以相遇的程度，导致管裂，否则它们始终会被阻止。应变计用于监测管外表面多个位置的环向应变。远离缺口，拉伸振动的测量频率与稳态Tang（1965）和Simkins（1987）模型所预测的频率相匹配。在凹口附近，由于在凹口处凸起而记录了压缩应变。分析对应于不同断裂事件的应变信号中的特征。

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