我们可以画一簇曲线，这簇曲线处处都有一个主方向作为切线，这些曲线叫做应力轨线。

We may draw curves which have everywhere one of these directions for a tangent, these curves are called stress trajectory.

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该系列点焊机，主变压器均为进口冷轨硅钢片，因此，主变压器功耗小，各型空载电流小。

Its main transformer is made of imported cold rolled silicon steel, So its power loss is little with low no-load current.

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介绍了冶金起重机金属结构偏轨箱形模拟主梁的疲劳失效分析研究结果，提出疲劳失效的原因及改进措施。

Failure analysis of side rail box imitating chief beam of metallurgy crane was studied. Cause of fatigue failure and improving method were given.

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