Through analyzes around the wellbore stress field and the crack stress field, has established around separately the wellbore stress field model and the crack effective stress model.
通过分析井筒周围应力场和裂缝应力场，分别建立了井筒周围应力场模型和裂缝的有效应力模型。
To prevent from heat crack, the choose of aluminum alloy with small crystal temperature range and the use of metal cast model, as well as adoption of gradual solidification style will be effective.
选择有效结晶温度范围小的铝合金、采用金属型铸型以及逐层凝固的冷却方式可以有效消除裂纹。
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