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Results show that the explosion properties of explosive containing 10%-20% RDX excel those of nitrolite, emulsive and mealiness explosive, and the explosion properties of explosive containing 40% RDX are same as those of TNT.

得到两大类型的混合炸药:Ⅰ型混合炸药(含RDX 10%-20%)的综合爆炸性能优于现有的梯、乳化及粉状工业炸药;Ⅱ型混合炸药(含RDX 40%)的爆炸性能与TNT相当。

The calculating results are compared with the test data in available literatures and FEM results. The research results show that the plastic hinge model is precise and correct, which can satisfy with the actual engineering demands. The collapse pressure of perforated liner casing decreases with phrase angle, initial ovalization and diameter-thickness ratio increasing, and increases with the yield stress. The phrase angle and initial ovalization have greatly influence on the collapse pressure. The collapse pressure of perforated liner casing is slightly changed with the diameter and density of perforation when the diameter and density are smaller than 12mm and 120 shots per meter, respectively.

计算结果表明:筛管抗挤强度的塑性模型具有很高的计算精度和准确度,可以满足工程实际需要;筛管抗挤强度随着射孔相位角、径厚比和初始椭圆度的增加而降低,随着屈服强度的增加而增加,相位角和椭圆度对筛管抗挤强度影响比较显著;在射孔直径小于12 mm、射孔密度小于120 孔/ m 时,筛管抗挤强度随射孔直径和射孔密度增加变化不明显。

The plastic hinge model of perforated liner casing is built up to calculate the collapse pressure according to the strength and deformation behavior of perforated liner casing subjected to external pressure. The calculation equations of collapse pressure of perforated liner casing with initial ovalization are deduced by energy method. The influences of phrase angle, diameter of perforation, shot density, initial ovalization, diameter-thickness ratio and yield stress on the collapse pressure of perforated liner casing are studied. The model and equations are used to calculate the collapse pressure of an actual perforated liner casing as example.

摘摇要:根据煤层气完井筛管受力特点建立了筛管受力的塑性模型,利用能量法推导出带有初始椭圆度筛管抗挤强度的计算公式,分析了相位角、射孔直径、射孔密度、初始椭圆度、径厚比和屈服强度等影响因素对筛管抗挤强度的影响规律,并对某煤矿使用的筛管抗挤强度进行了计算,与已有的实验数据和有限元计算结果进行了对比。

The plastic hinge model of perforated liner casing is built up to calculate the collapse pressure according to the strength and deformation behavior of perforated liner casing subjected to external pressure. The calculation equations of collapse pressure of perforated liner casing with initial ovalization are deduced by energy method. The influences of phrase angle, diameter of perforation, shot density, initial ovalization, diameter-thickness ratio and yield stress on the collapse pressure of perforated liner casing are studied. The model and equations are used to calculate the collapse pressure of an actual perforated liner casing as example.

根据煤层气完井筛管受力特点建立了筛管受力的塑性模型,利用能量法推导出带有初始椭圆度筛管抗挤强度的计算公式,分析了相位角、射孔直径、射孔密度、初始椭圆度、径厚比和屈服强度等影响因素对筛管抗挤强度的影响规律,并对某煤矿使用的筛管抗挤强度进行了计算,与已有的实验数据和有限元计算结果进行了对比。

Based on the finite element method, a fresh and unique type of footbridge, a papilionaceous partial tied arch footbridge, was analyzed. The influences to the whole structure's stress behavior, displacements, vibration periods and mode shapes under parabola and arc arch axis were discussed. Different selections of support forms, such as longitudinal slide or longitudinal hinge, led to different behaviors on structure.

针对一种新型而特殊的蝶式部分系杆拱步行桥,基于有限元数值分析比较抛物线形拱轴线和圆弧形拱轴线对整个结构受力、变形、周期和振型的影响,揭示选用纵向滑动支座与纵向不动支座时给结构性能带来的不同结果,对结构拉索张拉力的控制给出建议。

This papaer presents a new structure,which is compound large span structures of Γ frame parabolical three hinged arch space truss.

提出一种新型屋架结构——Γ型柱抛物线三拱空间桁架组合大跨结构,导出了该结构有关的设计计算公式。

In the axes section, we can find the restring force could transmiting.

通过对柱纵截面的应力分析,发现在柱体纵向约束力可以沿刚性方向进行传递。

The two stage telescopic lattice frame is composed of three boom sections sleeve-mounted together, tail end of the outmost basic boom frame is pivot-connected respectively with slewing mechanism and luffing mechanism on the chassis; the inner two section booms can telescope freely like a retractive antenna to change the delivering distance of the conveyor and the operating radius.

两级伸缩臂架由套装在一起的三节臂架组成,最外层的基础节臂架尾部和底盘的回转机构、变幅机构分别接,固定于底盘上;内层的两节臂架可如拉杆天线一般自由伸出和缩回,改变输递机的输送距离,从而改变施工半径。

The hinge is provided with a cover support section connected to the cover section, an opening and closing rotation mechanism attached through an axis to the main body, and a hinge axis to rotatively support the cover support section and the opening and closing rotation mechanism.

链设有一个连接于盖部的盖支承部分、一个通过轴装在主体上的开闭转动机构和一个可转动地支承盖支承部分和开闭转动机构的接轴。

Transient responses of the tiltrotor during the transition flight are calculated aiming at semispan soft-in-plane tiltrotor models with the elastic wing.

以半展长弹性机其全接式倾转旋翼机模型为例,分析倾转旋翼机倾转过渡飞行瞬态响应时间历程。

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Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气,收缩臀部肌肉;拱起身体,尽量抬起头来,右腿伸直朝向天花板(膝微屈,以避免肌肉紧张)。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化,但却比去年同期高8%。

However, to get a true quote, you will need to provide detailed personal and financial information.

然而,要让一个真正的引用,你需要提供详细的个人和财务信息。