失效机理 2

η = \frac{τ_{x, netto}}{f_{v, netto}} = \frac{\frac{n_{x y} e_{x}}{b_{x} \sum_{i, y} t_{i}}}{f_{v, netto}} \leq 1

η = \frac{τ_{y, netto}}{f_{v, netto}} = \frac{\frac{n_{x y} e_{y}}{b_{y} \sum_{i, x} t_{i}}}{f_{v, netto}} \leq 1

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