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tension tension
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     Based on the prediction model, the probability distribution of fatigue life and critical value of accumulated fatigue damage of notched mild carbon steel under multilevel tension tension variable amplitude loading is predicted according to Miners rule and expressions of fatigue life with given survivabilities obtained from rotary bending fatigue test under constant amplitude, and checked by test results.
     根据预测模型 ,采用旋转弯曲得到的带存活率的疲劳寿命表达式和Miner法则 ,对给定多级拉 拉变幅载荷谱下的正火 4 5钢缺口件变幅载荷下疲劳寿命下疲劳寿命和累积疲劳损伤临界值的分布进行预测 ,并通过拉 拉变幅载荷疲劳试验进行了验证。
短句来源
     It is shown that both the predicted fatigue life and the test results of fatigue life of notched elementals of 45 carbon steel under tension tension variable amplitude loading follow the log normal distribution, and the two distributions agree well with each other.
     结果表明 :4 5钢缺口件在多级拉 拉变幅载荷下的疲劳寿命和累积疲劳损伤临界值的预测值与试验值均近似服从对数正态分布 ,且两者符合很好。
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  “tension tension”译为未确定词的双语例句
     The responses of fatigue limit to mean stress of 2Cr13 steel were studied through tension tension and tension compression fatigue tests between room temperature and 450 ℃.
     研究了汽轮机叶片材料2Cr13马氏休不锈钢在室温到450℃之间拉—拉或拉—压疲劳试验过程中平均应力与疲劳极限之间的关系。
短句来源
     The random distribution of life is tested by EDF statistics values. Test data of T300/QY8911 16 , 24 and 3S under tension tension fatigue had been used for Monte Carlo simulation. The result shows that the life obeys Weibull distribution.
     根据T300/QY8911的三种典型层合板[0]16、[90]24和[±45]3S的拉—拉疲劳试验结果,利用蒙特卡洛模拟方法计算层合板的疲劳寿命,结果表明寿命服从Weibul分布。
短句来源
     A Tension Tension Fatigue Failure Criterion for Unidirectional Composite Laminates
     复合材料单向板面内拉拉疲劳失效准则
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     In the end, the physical quality of antimicrobial films was studied including of intensity of tension, tension rate and coefficient of oxygen permeation.
     最后还分析了镀Ag抗菌薄膜的物理性能,包括抗菌薄膜的抗拉强度、伸长率和透氧性能。
短句来源
     The test results showed that the influence of drawing ratio,speed and temperature on the tension,tension fluctuation and irregularity of the fiber were obvious.
     结果表明,拉伸比、拉伸速度和拉伸温度对纤维张力、张力波动和不匀率均存在着明显的影响。
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  相似匹配句对
     The Tension of Home
     家园下的张力
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     On Aesthetic Tension
     试论审美张力
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  tension tension
It was concluded that the reaction zone was the controlling factor in tension/tension fatigue.
      
The mechanism of failure in tension/tension fatigue was the initiation of cracks at the interface and their subsequent propagation in the matrix.
      
The growth of reaction zone was very detrimental to monotonic and cyclic tension/tension fatigue behavior.
      
Tension/tension FCP experiments were carried out using single-edge notch (SEN) specimens under load control.
      
The results confirm that even in a tension/tension loading mode, frictional heating may play a dominant role, at least in some systems.
      
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Comparafive Investigations of the fracture surfaces of woven Gr/Ep Composite coupons have been made in this stady by using ISI-60 SCANNING ELECTRON MICROSCOPE. Specimens of static and tension-tension fatigue tests at low and high temperatures were chosen for comparison. A primary observation was that during the fatigue tests the visible delimi tations at the edges often occured after 2×104 to 3×104 cycles. The delimitations in room temperature fatigue coupon were more serious than in the static coupon....

Comparafive Investigations of the fracture surfaces of woven Gr/Ep Composite coupons have been made in this stady by using ISI-60 SCANNING ELECTRON MICROSCOPE. Specimens of static and tension-tension fatigue tests at low and high temperatures were chosen for comparison. A primary observation was that during the fatigue tests the visible delimi tations at the edges often occured after 2×104 to 3×104 cycles. The delimitations in room temperature fatigue coupon were more serious than in the static coupon. The most serious delimitations were found in the high temperature fatigue coupon. The cracks in the matrix have the same tendency as well. The breakage surface of single fiber of fatigue coupon was more smooth than the static's.I would like to express my thanks to Prof. S. Hanagud, R. Carlson, J. Craig, Dr. R. Sigman and R.G. Clinton for all the helps they gave me in the work.

本文介绍了用ISI-60扫描电子显微镜对编织石墨/环氧复合材料试片断口表面的研究。试片取自静拉伸及低温和高温下拉——拉载荷下的疲劳试验。在疲劳试验过程中发现:当载荷循环数超过2×1O~4到3×1O~4时,在试片试验段的边缘处有可见的分层现象出现。在显微照片中可以看出:室温疲劳试片中的分层现象较静拉伸试片严重,而高温疲劳试片中的分层最为严重。基体中的微裂纹也有同样的趋势。在高倍放大照片中可以看到:静拉伸断裂的单根纤维的表面明显的比疲劳断裂的纤维断面粗糙。

In this paper tension-tension (R=0.1) fatigue behaviout and residual static tensile strength of unidirectional graphite/epoxy composite were studied by using GB 3354-82 specimens of straight-sided type with long gage length (GB-National Standard, China). The S-N curve and fatigue limit were obtained by means of test method in group and the staircase method. The number of stress cycles, at which the machine stops or the load drops due to the damage or crack occuring in the specimen, is taken as the...

In this paper tension-tension (R=0.1) fatigue behaviout and residual static tensile strength of unidirectional graphite/epoxy composite were studied by using GB 3354-82 specimens of straight-sided type with long gage length (GB-National Standard, China). The S-N curve and fatigue limit were obtained by means of test method in group and the staircase method. The number of stress cycles, at which the machine stops or the load drops due to the damage or crack occuring in the specimen, is taken as the life of the specimen at that stress level. The S-N curve is a straight line and tends to horizon near the fatigue limit.The fatigue limit is 0.325σb.The failure of specimens resulted from the development of the longitudinal cracks. The appearnce of longitudinal cracks is apparently due to shaer fractures. The shear fractures show that the fatigue behavior obtained bears a close relation with the properties of matrix and interface. The load-carrying capacity of fibers has not been fully utilized, so the S-N curve and fatigue limit obtained correspond to the lower limit of the tension-tension fatigue behaviour of graphite/epoxy unidirectional composite. The specimens with longitudinol cracks were also tested for residual static tensile strength which was found to be 0.7 σb or more. And the curves of load-deformation are straight lines up to 0.5σb then the loads keep increasing and fluctuating until the failure of specimens.

本文采用G8 3354—84规定的大标距直条试样对单向碳/环氧复合材料的拉—拉(R=0.1)疲劳性能和剩余静拉伸强度进行了研究。用成组试验法和升降法测定了S—N曲线和疲劳极限。试样疲劳破坏是由于沿纤维方向(纵向)疲劳裂纹的扩展引起的。试样剩余静拉伸强度大于0.7σ_b。

In order to study the fatigue life distribution of unidirectional graphite/epoxy composite, 50 specimens were tested at same stress level (σmax=48kgf//mm2)· X2 test and check with the graph on the normal probability paper are used. If the logarithmic fatigue life of these 50 specimens as a sample is taken from same population of Gaussian distribution, the theoretical frcquncy function cf this normal population can be obtainedThese data are dawn OH normal probability paper and we find these data are locatednear...

In order to study the fatigue life distribution of unidirectional graphite/epoxy composite, 50 specimens were tested at same stress level (σmax=48kgf//mm2)· X2 test and check with the graph on the normal probability paper are used. If the logarithmic fatigue life of these 50 specimens as a sample is taken from same population of Gaussian distribution, the theoretical frcquncy function cf this normal population can be obtainedThese data are dawn OH normal probability paper and we find these data are locatednear the linelogN= 6.0049+ 0.9330 Upwith linear dependence coefficient r=0.9950. The test data of 50 specimens at same stress levl show that the tension-tension fatigue life distribution of unidirectional graphite/ epoxy composite follows the logarithmic Gaussian distribution.

通过对同一应力水平上50根试件的大子样疲劳试验结果研究表明:单向碳/环氧复合材料拉—拉(R=0.1)疲劳寿命服从对数正态分布。

 
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