2) upset crack
顶锻裂纹
1.
There're many problems in quality of steel # 45 produced by LD-LF-CC in Laigang,such as surface pores and upset cracks.
莱钢采用LD-LF-CC(方坯连铸)生产45#钢铸坯质量存在较多问题,主要是表面气孔数量多、轧材顶锻裂纹等。
2.
Through hydrogen determination online during manufacturing process,analyzing inclusions element in 20CrMnTiH by SEM and EDAX analysis,and observing defects on the surface of casting blanks,mechanism of upset cracks of 20CrMnTiH smelted by converter in Laiwu steel is found.
莱钢炼钢厂通过生产过程在线定氢,用扫描电镜和能谱分析了20CrMnTiH钢夹杂组分;观察了铸坯表面缺陷;掌握了转炉冶炼该钢顶锻裂纹产生的机理;并在生产中采取了有效的控制措施,使其顶锻裂纹得到全面改善。
3) block-fractured top-coal
块裂顶煤
4) top coal fracture
顶煤压裂
1.
The author systematically studies change law of the damage variation D on top coal fracture with Mining depth H,coal strenth R c and seam thickness by elastic plastics coupling finiteelement numerical value analysis with cross test.
运用弹塑性耦合有限元数值分析正交试验法 ,系统研究了放顶煤开采中顶煤压裂的损伤变量 D随开采深度 H,煤的强度 Rc 和煤层厚度的变化规律 ,得出开采深度和煤的强度是影响顶煤损伤参数的主要因素 ,煤层厚度等因素影响是微弱
6) roof breaking
顶板断裂
1.
Based on caculation of three-dimensional finite element method and field ob-servatiOn results,this paper studies the antielasticity mechanism,affecting factors and the re-lation between abutment characteristics and roof breaking and discusses the engineering signifi-cance of anti-elasticity.
借助三维非线性有限元计算和现场实测结果，对“反弹”机理、影响因素、显现特征与顶板断裂的关系进行了探讨，并对其工程意义作了评述。
补充资料：贯顶
【贯顶】
（职位）同贯首。
（职位）同贯首。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条