通过对非对称渐开线圆柱直齿轮齿根弯曲应力的分析，结合接触强度的计算公式，建立了系统的数学模型。
Having analyzed the dedenda's bending stress of involute gears with asymmetric teeth, and the formula of contract strength, mathematic model of the system is built.
通过支撑辊弯曲强度解析计算，得出支撑辊辊颈和辊身的弯曲应力，并确定此支撑辊的薄弱点在辊颈处。
By analysis calculating bending strength of back-up roll, it can educe bending stress of end and body of back-up roll, and define weak spot that is both end of back-up roll.
在计算钻柱强度时，应考虑接头对钻杆弯曲应力的影响，以实现安全钻井。
The effect of tool joint must be considered in analysis of drillstring strength to reduce drillstring failure and keep safety in drilling process.
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