螺纹加厚
- 网络spiral thickening;spiral pitting
螺纹加厚-
导管与纤维管胞均具明显的螺纹加厚。
Vessel and fibre - tracheid are both spiral thickening distinctly .
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有限元对比分析结果表明，这些改进方案均不同程度地改善了螺纹及加厚过渡段的应力分布状况，降低了危险区域的应力集中，可以提高接头的抗扭性能及疲劳寿命。
The FEA results showed that the stress distribution and concentration in the weak areas were improved by theses optimization schemes compared to the API connections , as well as the torsional properties and fatigue strength of the connections .