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The Kirsh tenglamalari tasvirlab bering elastik stresslar bitta yo'nalish tarangligida cheksiz plastinkadagi teshik atrofida. Ularning nomi berilgan Ernst Gustav Kirsh.

Natija

Cheksiz plitani radiusli dumaloq teshik bilan yuklash a stress bilan σ, natijada paydo bo'lgan stress maydoni:

${displaystyle sigma _ {rr} = {frac {sigma} {2}} chap (1- {frac {a ^ {2}} {r ^ {2}}} tun) + {frac {sigma} {2}} chap (1 + 3 {frac {a ^ {4}} {r ^ {4}}} - 4 {frac {a ^ {2}} {r ^ {2}}} ight) cos 2 heta}$

${displaystyle sigma _ {heta heta} = {frac {sigma} {2}} chap (1+ {frac {a ^ {2}} {r ^ {2}}} tun) - {frac {sigma} {2} } chap (1 + 3 {frac {a ^ {4}} {r ^ {4}}} ight) cos 2 heta}$

${displaystyle sigma _ {r heta} = - {frac {sigma} {2}} chap (1-3 {frac {a ^ {4}} {r ^ {4}}} + 2 {frac {a ^ {2 }} {r ^ {2}}} ight) sin 2 heta}$

Adabiyotlar

• Kirsch, 1898 yil, Die Theorie der Elastizität und die Bedürfnisse der Festigkeitslehre. Zeitschrift des Vereines deutscher Ingenieure, 42, 797–807.