This paper sets up an instantaneous cutting force model for a spiral cylinder cutter by analyzing the linear relationship between micro-unit milling force and instantaneous uncut chip thickness. 通过微元铣削力与瞬时未变形切屑厚度之间的线性关系,提出了螺旋圆柱铣刀的瞬时切削力模型。
A new damage softening constitutive model for rocks is developed based on a new form of damage variable which is defined with rock micro-unit strength. 结合岩石微元强度提出了损伤变量的新形式,据此建立了新的岩石损伤软化本构模型。
Based on that the strength of rock micro-unit obeys the Weibull random distribution, this paper presents a damage constitutive model reflecting the full process of rock failure. 本文从岩石微元强度服从Weibull分布的角度出发,建立了模拟岩石破裂全过程的损伤本构模型。
By discussing the form of new rock micro-unit strength based on Mohr-Coulomb criterion, which satisfies Weibull random distribution, a statistical damage softening constitutive model reflecting the full process of rock failure was developed based on the stress-strain curve of tri-axial tests for rocks. 从探讨基于Mohr-Coulomb准则的新的岩石微元强度表示方法及其服从Weibull随机分布的特点出发,基于岩石三轴应力应变试验曲线,建立了反映岩石破裂全过程的损伤软化统计本构模型。
Failure criterion of rock, as the distribution variable of the micro-unit strength in the constitutive model, greatly affects stress-strain curve and the equivalent elastic modulus of rock, and it must be chosen carefully for specific rock. 分析结果表明,将岩石破坏准则作为微元强度分布变量建立统计损伤本构模型时,破坏准则的选择对建立的模型曲线和损伤岩石等效弹性模量的影响较大,因此应选取合适的岩石破坏准则。
The third part is to build regenerator process model using energy balance between micro-unit regenerator and gas according to classic thermal theory and heat transfer theory. Simulation of regenerator working process and optimization of exchange period and gas flow are both based on the model. 依据经典热学与传热学理论,采用微元蓄热体与气体能量守恒的思路建立蓄热室过程模型并利用该模型模拟换向工作过程以及气体流量、换向周期的决策。
Milling cutter micro-unit analysis method is introduced, and the corresponding coordinate system is set up at the same time. Micro-unit can be taken as diamond round saw and dish-shaped disk to separately establish cutting force model in each projection plane. 引入了铣刀微元分析方式,同时建立了相应坐标体系,并在各投影平面内将微元作为金刚石圆锯片和碟形铣磨盘分别建立切削力模型。
Using a combination of "Central speech act+ Auxiliary speech act+ Micro-unit", Japanese love to use Central speech act of" direct disagreement", while Chinese love to "expression their own views" as the Central speech act. 使用中核行为+辅助行为+修饰语的时候,日语多使用明确地表达不同意,而汉语多使用说明自己的意见来作为核心行为。
Referring to the force analysis principle of single grain of diamond, the force of the contacting arc surface on micro-unit is analyzed and the corresponding theoretical model of cutting force is established to obtain the theoretical calculation formula of cutting force on special-shaped surfaces through integral. 参考单颗粒金刚石受力分析原理,对微元接触弧面受力进行了分析,建立了相应切削力理论模型,通过积分获得了异型面切削力的理论计算公式。