[請益] 關於期刊英文翻譯...
小弟最近讀到某篇製造相關的期刊,但讀到某一段真的是看不懂文意...
煩請版上強者為小弟解惑
內文如下:
In the weld metal with lower strength, as in the case
of GTAW joint, since the deformation and the yielding
are mainly concentrated in the weld metal zone, the
extension of the plastic zone is limited within the weld
metal. As soon as the plastic zone reaches the fusion line,
plasticity keeps on developing along the interface
between the parent material and the weld metal[19]. The
triaxial state of stress is high in the weld metal and the
relaxation of this stress is poor. The crack driving force
needed for crack extension is small, so the fracture
toughness of the weld metal with lower strength is not
high. On the other hand, if the strength of the weld metal
is more or less equal to the base metal, as in the case of
FSW joint, the plastic zone can easily extend into the
parent material because the deformation and yielding
occur in both weld metal and the base metal. The stress
relaxation can easily take place in the crack tip region, so
more crack driving force is needed for crack extension
and the fracture resistance of the weld metal with higher
strength is greater than that of the lower strength[20].
This is also one of the reasons for the better fatigue
performance of the FSW joint.
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