什么叫刚度?机床刚度曲线有什么特点?
刚度是指切削力在加工表面法向分力,Fr与法向的变形Y的比值。机床刚度曲线特点:刚度曲线不是直线;加载与卸载曲线不重合;载荷去除后,变形恢复不到起点。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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