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飞机受损件激光喷丸残余应力调控研究
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作者 张俊豪 程秀全 +1 位作者 夏琴香 程思竹 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2022年第3期73-79,共7页
论文基于残余压应力-激光喷丸搭接率的拟合关系式,设计出非均匀搭接率下的激光光斑位置路径;基于ABAQUS软件建立了7075-T6铝合金受损件激光喷丸有限元模型,实现了非均匀搭接率下激光喷丸有限元数值模拟并获得残余应力场的分布情况。结... 论文基于残余压应力-激光喷丸搭接率的拟合关系式,设计出非均匀搭接率下的激光光斑位置路径;基于ABAQUS软件建立了7075-T6铝合金受损件激光喷丸有限元模型,实现了非均匀搭接率下激光喷丸有限元数值模拟并获得残余应力场的分布情况。结果表明,采用非均匀搭接率的激光喷丸方法可使试样表面在打磨或受到拉伸载荷后仍处于应力均匀分布的状态;通过增加搭接率调控残余应力值的大小,还可实现修复件表面在受到拉伸载荷时处于均匀压应力状态,从而抑制疲劳裂纹的萌生和扩展。试验结果与模拟结果一致,验证了模型的可靠性。 展开更多
关键词 7075铝合金 受损件 激光喷丸 非均匀搭接 残余应力调控
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结构受损的岸边集装箱起重机的安全评估
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作者 张博 《机电技术》 2019年第1期82-85,共4页
某码头一台岸边集装箱起重机,因前伸臂在俯仰收回过程中,左侧前大拉杆与左侧箱梁错位干涉,致使相关构件受损。为掌握和评估结构件受损程度,整机继续使用的可靠性以及前伸臂、前大拉杆的受力状态,对前伸臂左侧箱梁和左侧前大拉杆的局部... 某码头一台岸边集装箱起重机,因前伸臂在俯仰收回过程中,左侧前大拉杆与左侧箱梁错位干涉,致使相关构件受损。为掌握和评估结构件受损程度,整机继续使用的可靠性以及前伸臂、前大拉杆的受力状态,对前伸臂左侧箱梁和左侧前大拉杆的局部波浪度、变形量和联结铰支座垂直度进行测量;对前伸臂左侧箱梁和左侧前大拉杆干涉区域焊缝及母材进行无损探伤检测;对前伸臂段左、右侧主梁干涉区域高低差进行测量;对相互干涉侧前伸臂箱梁上翼缘板水平偏斜进行测量;对前伸臂与前大拉杆结构件动载应力测试:最终完成受损结构件及整机的安全评估。 展开更多
关键词 岸边集装箱起重机 结构受损 动态应力分析 安全评估
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Management of multiple trauma with mainly thoracic and abdominal injuries: a report of 1166 cases 被引量:5
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作者 杨俊 高劲谋 +3 位作者 胡平 李昌华 赵山宏 林曦 《Chinese Journal of Traumatology》 CAS 2009年第2期118-121,共4页
Objective: To discuss the diagnosis and treatment of multiple trauma with mainly thoracic and abdominal injuries. Methods: A retrospective analysis was performed on data of multiple trauma cases with mainly thoracic... Objective: To discuss the diagnosis and treatment of multiple trauma with mainly thoracic and abdominal injuries. Methods: A retrospective analysis was performed on data of multiple trauma cases with mainly thoracic and/or abdominal injuries. Results: Of 1166 cases, 72.3% were found with shock. The operation rates of thoracic and abdominal injuries were 14.8% (119/804) and 83.5% (710/850) respectively ( x^2=780.683, P 〈0.01). The operation rates of blunt and penetrating thoracic injuries was 6.8% (42/617) and 40.6% (76/187) respectively ( x^2=131.701, P〈0.01). The operation rates of blunt and penetrating abdominal injuries were 77.1% (434/563) and 96.1% (276/287) respectively ( x^2=50.302, P〈0.01). The operation rates of blunt thoracio-abdominal injuries were 6.8% (42/617) in thoracic region and 77.1% (434/563) in abdomen respectively (x^2=544.043, P〈0.01 ). Among the cases of abdominal injuries, 41 received arteriography embolism, with the efficacy of 95.1% (39/41). Total mortality rate was 6.1%. The mortality rates of blunt and penetrating injuries were 7.3% (62/854) and 2.9% (9/312) ( x^2=6.51, P〈0.005). The deaths were mainly due to large volume of blood loss. Conclusions: When both thoracic and abdominal injuries exist, laparotomy is frequently required rather than thoracotomy. Laparotomy is seldomly used for blunt thoracic injuries, but usually used for penetrating thoracic and abdominal injuries. Mortality rate of penetrating thoracic and abdominal injuries is markedly lower than that of blunt injuries. Surgical operation is still important for those patients with penetrating thoracic or abdominal injuries. 展开更多
关键词 Multiple trauma Thoracic injuries Abdominal injuries HEMOSTASIS Surgical procedures operative
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