the results show that, the strength and charpy impact energy of the steel firstly increases then decreases as the silicon content increases and the strength and charpy impact energy is maximum at some silicon content.

to investigate the reason of the great difference in impact toughness of welding seam of high frequency welding pipe, samples taken from base metal, heat affected zone and welding seam were analyzed through microscopy.

为查明J55钢高频焊管焊缝处的冲击功差异较大的原因，对母材、焊接热影响区及焊接区进行了微观分析。

互联网摘选

the synergistic effect increased with the increasing of impact energy as to the high manganese steel, which accounted for 12.08%, 19.50%, 23.11% and 26.70% respectively.

高锰钢腐蚀磨损交互作用随着冲击功的增大而增大，冲击功为1J、2J、3J、4J时的交互作用在总腐蚀磨损中所占比例分别为12.08%、19.50%、23.11%和26.70%。

互联网摘选

the drill pipe failure assessment demonstrates the longitudinal brittle fracture will be avoided when the transverse impact power of the material is over 80j.

应用钻杆失效评估技术研究表明，横向材料冲击功大于80J将避免钻杆内螺纹接头纵向脆性开裂失效。

互联网摘选

the strong instability of-40 ℃ longitudinal impact strength of e42 shipbuilding steel observed in trial production was studied by using different processes.

采用不同的生产工艺制度，对E42船板钢在工业试制生产中所产生的-40℃纵向冲击功波动较大的现象进行了研究。

互联网摘选

for these results of mentioned above two methods, the experimental data fitted by the regression technique shows that there is a good corresponding relationship between shear strength and charpy impact value.

对上述两种方法的试验结果经过回归处理，表明剪切强度与Charpy冲击功之间有较好的对应关系。

互联网摘选

after esr the 77 k impact work is up to 300 j, the fracture mode is of mixed microvoid coalescence and quasi cleavage.

经电渣重熔后，韧脆转变现象消失，77K的冲击功高达300J，断口以韧窝为主并有少量准解理小刻面。

互联网摘选

it is turned out the content of elements c, mn and s affects the lateral impact energy.

结果表明，影响横向冲击功的是C、Mn、S三元素的含量。

互联网摘选

a correlation between transition temperatures of absorbed energy and fracture toughness, cod

冲击功与COD转变温度的相关关系

互联网摘选

impact energy gets to the maximum of 72.768 j at 20 ℃.

20℃时的冲击功高达72.768J。

互联网摘选

the final parts sintered by two steps sintering in reducing atmospheres were then infiltrated with copper. the tensile strength of the material reached 480 mpa, elongation ratio 13% and impact energy 140 j.

对还原气氛二步烧结件进行渗铜处理，渗铜件抗拉强度为480MPa，延伸率为13%，冲击功为140J。

互联网摘选

the material pushing unit comprises a driving unit, a store holder and a base plate;

推料单元包括驱动单元、储料器和底板；

互联网摘选

this paper is a description of the technical development, flow, function and key control of modern cable drilling and its profit in ziliujing salt site.

本文论述了近代冲击式（顿钻）凿井技术的发展、工艺流程、功能、关键技术操控等，以及在自流井盐场运用所取得的综合效益。

互联网摘选

optimal design of valveless hydraulic impact-rotary driving head of roofbolter based on genetic algorithm

基于遗传算法的无阀液压冲击旋转型锚杆钻机动力头优化设计

互联网摘选

ultimate penetration depth of projectiles based on shock wave theory

基于冲击波理论的钻地武器极限侵深近似分析

互联网摘选

the force reaches largest in the first force wave when drill the upper copper foil. it decreases in glass fiber/ resin. the intertwined fibers cause great changes of drilling torques.

钻削上表层铜箔时由于叠加冲击力，钻削轴向力达到最大；钻削玻纤与树脂的轴向力较小，纤维互相交错存在导致钻削扭矩变化比较大。

互联网摘选

the target of drilling bits is deduced for high-gas coalbed, the influence of gas and damage of coal mass is considered in this paper.

考虑瓦斯的影响和煤体损伤特性，经理论推导得到了含瓦斯煤层检测冲击地压的钻屑量指标，并结合阜新五龙矿的实际情况进行了验证。

互联网摘选

a study on the percussion reversed drilling method

冲击反循环钻凿方法应用研究

互联网摘选

the siberian branch of russian academy of sciences said that the popigai crater in eastern siberia contains "many trillions of carats" of so-called "impact diamonds"--good for technological purposes, not for jewelry, and far exceeding the currently known global deposits of conventional diamonds.

俄罗斯科学院西伯利亚分院表示，西伯利亚东部的珀匹盖陨石坑内有“数万亿克拉”的“冲击钻”，是良好的工业钻石，而不是用来打造珠宝。这一储量比目前已知的全世界钻石矿储量的总和还超出很多。

互联网摘选

a. position the bores according to the product. drill φ 6 bores respectively with impact driller, after the center line for bolt bore is drawn in the appropriate position on the wall.

根据产品安装孔位，在墙面相应位置画出螺钉孔中心线后，用冲击钻分别钻φ6孔。

互联网摘选

this is the feedback of the seepage cutting concrete wall construction materials after masonry drills boring and casting underwater in the conditions of quaternary geology.

这是第四纪地质条件下经冲击钻造孔并进行水下浇筑混凝土防渗墙工程资料的反馈。

互联网摘选