CREATION OF OPTIMAL MOVEMENT STRATEGY OF PLURAL MOVING OB-JECTS BY GA

ＣＲＥＡＴＩＯＮＯＦＯＰＴＩＭＡＬＭＯＶＥＭＥＮＴＳＴＲＡＴＥＧＹＯＦＰＬＵＲＡＬＭＯＶＩＮＧＯＢ－ＪＥＣＴＳＢＹＧＡＣＲＥＡＴＩＯＮＯＦＯＰＴＩＭＡＬＭＯＶＥＭＥＮＴＳＴＲＡＴＥＧＹＯＦＰＬＵＲＡＬＭＯＶＩＮＧＯＢ－ＪＥＣＴＳＢＹＧＡＳｕＳｕｃｈｅ...     

CALCULATION AND EXPERIMENTAL INVESTIGATION OF ELECTRIC FIELDS INDUCED BY ELECTRODES IN ELECTROSTATIC CHARGED POWDER SPRAYING TECHNIQUE

ＣＡＬＣＵＬＡＴＩＯＮＡＮＤＥＸＰＥＲＩＭＥＮＴＡＬＩＮＶＥＳＴＩＧＡＴＩＯＮＯＦＥＬＥＣＴＲＩＣＦＩＥＬＤＳＩＮＤＵＣＥＤＢＹＥＬＥＣＴＲＯＤＥＳＩＮＥＬＥＣＴＲＯＳＴＡＴＩＣＣＨＡＲＧＥＤＰＯＷＤＥＲＳＰＲＡＹＩＮＧＴＥＣＨＮＩＱＵＥＣＡＬＣＵＬ...     

EXPERIMENTAL STUDY ON OPEN－DIE COLD EXTRUSION FORMING TECHNIQUE FOR INVOLUTESPLINE SHAFTS

ＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＮＯＰＥＮ－ＤＩＥＣＯＬＤＥＸＴＲＵＳＩＯＮＦＯＲＭＩＮＧＴＥＣＨＮＩＱＵＥＦＯＲＩＮＶＯＬＵＴＥＳＰＬＩＮＥＳＨＡＦＴＳＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＮＯＰＥＮ－ＤＩＥＣＯＬＤＥＸＴＲＵＳＩＯＮＦＯＲＭＩＮ...     

STUDY ON CONTROLLABLE MISMAT－CHED ENGAGEMENT OF CONE－GEN－ERATED CYLINDRIC WORM GEARING

ＳＴＵＤＹＯＮＣＯＮＴＲＯＬＬＡＢＬＥＭＩＳＭＡＴ－ＣＨＥＤＥＮＧＡＧＥＭＥＮＴＯＦＣＯＮＥ－ＧＥＮ－ＥＲＡＴＥＤＣＹＬＩＮＤＲＩＣＷＯＲＭＧＥＡＲＩＮＧＳＴＵＤＹＯＮＣＯＮＴＲＯＬＬＡＢＬＥＭＩＳＭＡＴ－ＣＨＥＤＥＮＧＡＧＥＭＥＮＴＯＦＣＯＮＥ－Ｇ...     

CORRELATION TESTING METHOD FOR DETE-RMINING DISTRIBUTION OF MEASUREMENT DATA

ＣＯＲＲＥＬＡＴＩＯＮＴＥＳＴＩＮＧＭＥＴＨＯＤＦＯＲＤＥＴＥ－ＲＭＩＮＩＮＧＤＩＳＴＲＩＢＵＴＩＯＮＯＦＭＥＡＳＵＲＥＭＥＮＴＤＡＴＡＺｈｕＱｉｏｎｇｃｈａｎｇ，ＨｕａｎｇＹｉｈｏｎｇＳｏｕｔｈＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇｙ...     

THEORETICAL ANALYSIS AND EXPERIMENTAL INVESTIGATION OFTHE INFLUENCE OF BEARINGMISALIGNMENT ON STABILI

ＴＨＥＯＲＥＴＩＣＡＬＡＮＡＬＹＳＩＳＡＮＤＥＸＰＥＲＩＭＥＮＴＡＬＩＮＶＥＳＴＩＧＡＴＩＯＮＯＦＴＨＥＩＮＦＬＵＥＮＣＥＯＦＢＥＡＲＩＮＧＭＩＳＡＬＩＧＮＭＥＮＴＯＮＳＴＡＢＩＬＩＴＹＯＦＲＯＴＯＲ－ＢＥＡＲＩＮＧ　ＳＹＳＴＥＭＨｕａｎｇＷｅｎｚｈ...     

CONSTRUCTION OF INTEGRATED CAD TOOLS ENVIRONMENT TO SUPPORT CONCURRENT COLLABORATIVE DESIGN

ＣＯＮＳＴＲＵＣＴＩＯＮＯＦＩＮＴＥＧＲＡＴＥＤＣＡＤＴＯＯＬＳＥＮＶＩＲＯＮＭＥＮＴＴＯＳＵＰＰＯＲＴＣＯＮＣＵＲＲＥＮＴＣＯＬＬＡＢＯＲＡＴＩＶＥＤＥ－ＳＩＧＮＣＯＮＳＴＲＵＣＴＩＯＮＯＦＩＮＴＥＧＲＡＴＥＤＣＡＤＴＯＯＬＳＥＮＶＩＲＯＮＭＥＮＴ...     

PREDICTION OF PUMP CHARACTERISTICS ACCORDING TO GEOMETRICAL PARAMETERS OF IMPELLER AND VOLUTE CASING

ＰＲＥＤＩＣＴＩＯＮＯＦＰＵＭＰＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＣＣＯＲＤＩＮＧＴＯＧＥＯＭＥＴＲＩＣＡＬＰＡＲＡＭＥＴＥＲＳＯＦＩＭＰＥＬＬＥＲＡＮＤＶＯＬＵＴＥＣＡＳＩＮＧＰＲＥＤＩＣＴＩＯＮＯＦＰＵＭＰＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＡＣＣＯＲＤ...     

STUDY ON THE INCREASE OF SLOPE-WALKING ABILITY OF MULTI－LEGGED ROBOT

ＳＴＵＤＹＯＮＴＨＥＩＮＣＲＥＡＳＥＯＦＳＬＯＰＥ－ＷＡＬＫＩＮＧＡＢＩＬＩＴＹＯＦＭＵＬＴＩ－ＬＥＧＧＥＤＲＯＢＯＴＳＴＵＤＹＯＮＴＨＥＩＮＣＲＥＡＳＥＯＦＳＬＯＰＥ－ＷＡＬＫＩＮＧＡＢＩＬＩＴＹＯＦＭＵＬＴＩ－ＬＥＧＧＥＤＲＯＢＯＴＸｕＰｅｉｊｕ...     

RECOGNITION OF STRUCTURAL DIAGRAM OF MACHINE TOOL SPEED CHANGE SYSTEM WITH ANY COMPOSITE RATIO

ＲＥＣＯＧＮＩＴＩＯＮＯＦＳＴＲＵＣＴＵＲＡＬＤＩＡＧＲＡＭＯＦＭＡＣＨＩＮＥＴＯＯＬＳＰＥＥＤＣＨＡＮＧＥＳＹＳＴＥＭＷＩＴＨＡＮＹＣＯＭＰＯＳＩＴＥＲＡＴＩＯＲＥＣＯＧＮＩＴＩＯＮＯＦＳＴＲＵＣＴＵＲＡＬＤＩＡＧＲＡＭＯＦＭＡＣＨＩＮＥＴＯＯＬＳ...     

基于微观孔洞型损伤的疲劳蠕变寿命预测方法

孔洞型损伤是延性金属材料一种常见的破坏形式.对于材料疲劳蠕变破坏过程,文中提出等效孔洞体积概念,从微观唯象角度出发,综合考虑疲劳蠕变对孔洞体积长大的影响,得到一种微孔洞型疲劳蠕变寿命预测模型.以此模型对1.25Cr0.5Mo钢540℃应力控制下疲劳蠕变寿命进行预测,结果显示该模型具有很好的适用性.     

Development of an anisotropic constitutive model for single-crystal superalloy for combined fatigue and creep loading

A unified anisotropic viscoplastic constitutive model for single-crystal superalloys is developed based on a modification of a phenomenological isotropic model. Orientation-dependent viscoplastic behaviour was observed in experiments. The model is used to simulate the orientation and cyclic mechanical response of single-crystal SRR99 under combined fatigue and creep conditions at 950°C. The results from the simulations are then used to estimate the fatigue-creep lives of the single-crystal nickel-base superalloy SRR99 using a new life prediction methodology. The predicted fatigue-creep lives are in good agreement with the experimental results.     

一种基于熵增理论的疲劳-蠕变交互作用损伤模型及试验验证

根据经典热力学理论,材料疲劳-蠕变交互作用下的损伤过程可视为系统熵增的累积,当熵增积累到临界值时,材料发生失效断裂。按此理论,并基于连续损伤力学和能量守恒定律,以系统熵增的变化来描述材料损伤,建立了一种疲劳-蠕变交互作用的损伤模型。为验证该模型,进行了540℃和520℃环境下1.25Cr-0.5Mo钢应力控制的梯形波加载试验,以材料的残余应变反映熵增积累,选取残余应变的变化作为损伤变量,用上述损伤模型进行了材料疲劳-蠕变交互作用的损伤演化描述,结果表明实测损伤点数据与该模型的损伤演化规律符合较好。     

钛合金显微组织与疲劳-蠕变复合性能的关系

研究了钛合金显微组织对疲劳-蠕变复合性能的影响后发现,在强烈疲劳-蠕变交互作用下,双态组织具有最好的疲劳-蠕变寿命。     

一种疲劳-蠕变交互作用寿命预测模型及试验验证

基于延性耗竭理论和损伤力学,对材料疲劳-蠕变交互作用下的延性消耗、损伤、循环周次和失效寿命之间的关系进行了分析,在此基础上,建立了一种疲劳-蠕变交互作用的寿命预测模型,模型形式简单,非常便于实际工程应用。通过1.25Cr0.5Mo钢光滑试样540℃和520℃环境下应力控制的梯形波加载试验,用该模型进行了失效寿命的预测,可以很好地解释相同温度和加载条件下的寿命波动,预测结果与实测结果符合较好。     

310钢蠕变裂纹扩展的温度和应力依赖性

本文在600～800℃和11.8～56.8MPa的初始净截面应力下研究了310钢蠕变裂纹扩展行为。试验结果表明,裂纹扩展激活能随裂纹长度增加而养活是由于断裂方式由沿晶向穿晶转变所致;第二阶段加载点位移速率具有蠕变速率特性,它表征裂纹前沿局部蠕变速率;初始净截面应为与Larson-Miller参数之间存在类似于蠕变试验中应力与Larson-Miller参数之间的关系。     

考虑高温蠕变的螺栓和法兰材料的选配*

螺栓和法兰材料的选择是影响螺栓法兰接头密封性能的重要因素,特别是在高温条件下服役,螺栓法兰发生蠕变的情况下。分别选择法兰蠕变速率大于螺栓蠕变速率以及小于螺栓蠕变速率的两组配合方式,通过传热分析、热-结构耦合分析以及高温蠕变分析,对比研究其密封性能。结果表明:螺栓蠕变和法兰蠕变都会引起螺栓应力重新分配,随着时间延长螺栓蠕变的累积会导致螺栓截面应力越来越均匀;但法兰蠕变的累积会降低法兰刚度,致使偏转角增大进而导致螺栓内外侧受力相差越来越大;法兰蠕变速率越大,法兰整体刚度下降越快,法兰服役周期越短,因此选择高温服役的螺栓法兰接头材料时,选取的法兰材料蠕变速率不能太大,且抗蠕变性能要比螺栓材料强。     

考虑载荷交互作用的蠕变损伤累积和剩余寿命估算

提出两级加载条件下考虑加载历史影响的蠕变损伤演变方程和剩余寿命估算方法,分析结果表明,高一低加载时,由于硬化严重,损伤演变速率减缓,使寿命分数之和大于1;而在低一高加载时,由于硬化较弱,引起损伤演变速率加速,使寿命分数之和小于1。受损材料的硬化状态对后续载荷下的损伤演变过程具有明显的影响,本文方法反映的加载顺序效应与试验观察一致。     

An anisotropic creep damage model for multiaxial cyclic loading histories

The purpose of this study is the development of an anisotropic creep damage theory within the continuum damage mechanics, applicable to creep-dominated cyclic loading histories. A damage distribution is expressd in rate form as a symmetric tensor of rank necessary to match physically measured damage. A theoretical model which expresses general anisotropic creep damage phenomena with power law cavity growth is proposed. The coupling of damage with a bounding surface cyclic viscoplasticity theory is also accomplished. Comparison with experimental results are made for weakly anisotropically damaging materials, type 304 stainless steel at 593°C. Good correlation of rupture time, secondary creep, and tertiary creep has been obtained for proportional and nonproportional, isothermal, constant isochronous nominal stress loading histories. A modification of the isochronous stress (the set of stress state which have a same rupture time) for compressive hydrostatic stress state has been offered.     

组织特征对粉末高温合金FGH96疲劳裂纹扩展速率的影响

通过对不同热处理后获得3种典型显微组织的粉末高温合金FGH96合金试样在650 进行保载90 s和5 s并恒载荷循环应力作用下的疲劳试验,研究组织特征对疲劳裂纹扩展速率的影响规律,确定不同载荷条件下孕育期、萌生期、扩展期及瞬断期所占的比率。结果表明,γ相特征显著影响疲劳裂纹扩展速率;疲劳行为对保载时间存在敏感性,随保载时间的延长,在疲劳-蠕变的交互作用下会明显加快合金疲劳裂纹扩展;在整个疲劳破坏过程中,萌生比率均高于扩展比率,说明该合金抗裂纹萌生的能力要高于抗裂纹扩展的能力;此外,该合金疲劳裂纹扩展四个阶段在整个断裂周次所占的比率分配上,孕育期比率一般较小,萌生期和扩展期比率较大,瞬断期的比率很小,表明该合金裂纹扩展一旦失稳将高速扩展并迅速断裂。