【摘要】 根据可靠性理论，从分析零件的失效概率和可靠度出发，应用变异系数法，求出安全系数的数学表达式，使安全系数取值较合理。更多还原

【Abstract】 A mathematical expression for the safety factos is derived with the theory of reliability and the method of variance factor in the machine design. This expression can be used to analyse probability and the reliabi- lity of machine parts. With this expression, the safety factor can be calculated more reasonably.更多还原