2017年6月12日 周一

Analysis of grit interference mechanisms for the double scratching of monocrystalline silicon carbide by coupling the FEM and SPH
Nian Duan, Yiqing Yu, Wenshan Wang, Xipeng Xu⁎ Institute

When grinding with an abrasive tool, the workpiece surfaces are
produced by the accumulated cutting action of numerous abrasive grits protruding from the grinding tool surface [1].

介绍了磨削的本质:多磨粒累加的切削行为,关键词在于多个磨粒、累加、切削

Many studies [4,5,7– 9,11,13,15,18] on scratching using a single abrasive grit have been performed using experiments and simulations. To explore the mechan- ism of the entire grinding process, it is important to gain insight into the mechanism of single grain grinding, which is often referred to as scratching with a single abrasive grit in the literature. 

紧接展开讲针对磨削的研究的研究方法:实验模拟两种途径,实验是单磨粒磨削/刻划实验

The scratching process is a series of integrated vertical pressing
processes along the scratching direction. The formation of the crack system in the indentation process is similar to that in the scratching process [4–7]. However, tangential motion is introduced in the scratching process, which leads to a different deformation and fracture behaviour of the material. 

先讲刻划过程的本质是竖直方向的下压作用,但是在水平方向则和印压过程有很大区别,这里虽然很好地解释了刻划实验,但是解释的方式可能是不准确的,比如没有证据支持“竖直方向就是下压”这样的论点,因为材料流动造成的影响,其应力场和印压过程差异巨大。

However, the combined action of multiple abrasive grains is not a
simple superposition of the single abrasive particle scratching action, and research on the removal mechanism of the two abrasive particles is an important step to obtain the final surface topography from the comprehensive effect of multiple grains. The interference scratching duration is extremely short; thus, the experiment is primarily used to deduce the interference process based on the results. Accordingly, the limitation of the experimental method at the micro- and nano-scales confines the research to the interference scratching of the material removal mechanism. 

讲述了磨削中的累加效应并非简单的叠加,而是会有磨粒之间的相互作用的。

文章的研究对象就是磨削,引言的思路从磨削总起,然后在单点金刚石磨削和多磨粒磨削实验方面广泛引用,解释磨削基础研究的基本方法和基本思路,即单磨粒-(累加效应)多磨粒相互作用

而我们写作的对象是微结构加工,和磨削既有相似也有不同,相似在于同样要研究多磨粒作用时的相互作用,不同在于加工时不能出现脆性行为,因此还需要考虑相互作用对于脆塑转变的影响。

根据Rankine法则,只要在刻划过程中,某一处的最大主应力超过一个特定的拉应力值,就会产生裂纹,因此应力场应当成为研究的重点。而多磨粒刻划实验的应力场相对于单磨粒刻划实验时的变化,就是本研究的研究目标。

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s