sigmoid notch length 乙状切迹长度
Research conclusions: The notch form, height of compound notch and notch length were the key factors to cool tower collapse.
研究结论：切口形式、复合切口高度、切口长度，是确保冷却塔倒塌的最关键技术；
Cut a 70-degree notch into the tree with a length of 80 percent of the trunk’s diameter.
在树根处砍一个缺口，缺口的深度应该是树木直径的80%，其角度大约为70度。
For a given specimen and notch configuration, maximum load is always dependent on the crack length and independent of the material.
对于特定的试样和裂口几何形状，最大荷载与裂纹长度有关，而与材料无关。
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