S***s
发帖数: 67 | 1 I have run a S-S-S-S plate (dimension 1.0x1.0x0.2) problem with uniform
pressure (P=10,000) applied at the bottom surface.
Case 1. 20x20x10 linear elements (solid45)
The value of Szz at the center of the top traction-free surface is -286.94,
around 1% of the maximum Szz, and around 3% of the Szz value at the center
of the bottom surface, which is -9713 (should be -10,000 analytically).
Case 2. 20x20x15 quadratic elements (solid186)
The value of Szz at the center of the top traction-free surface |
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S***s
发帖数: 67 | 2 I have run a S-S-S-S plate (dimension 1.0x1.0x0.2) problem with uniform
pressure (P=10,000) applied at the bottom surface.
Case 1. 20x20x10 linear elements (solid45)
The value of Szz at the center of the top traction-free surface is -286.94,
around 1% of the maximum Szz, and around 3% of the Szz value at the center
of the bottom surface, which is -9713 (should be -10,000 analytically).
Case 2. 20x20x15 quadratic elements (solid186)
The value of Szz at the center of the top traction-free surface |
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s*******f
发帖数: 1114 | 6 惊天股市操纵案全面引爆中国官民网络战
谁 也没有想到，在貌似平静的周末，一场官民网路站突然爆
发。这场网络战的起因是一场史无前例的惊天股市操纵案。目
标是否严惩或是包庇有后台有背景的犯罪分 子。
当中国亿万股民沉浸在久违的大牛市行情时候，2010年10月
26日开始，一场神不知鬼不觉的阴谋在策划和行动中。大约20
家券商在期货市场开 始起利用这波脆弱的牛市，大赚一笔的
勾当。他们逆势为而为，暗暗建立空单大仓。此时的股市已经
是压抑两年的火山，一发不可收拾，两市成交量屡屡突破创记
录 的50000亿元，按照量价规律，没有人怀疑这是一个大牛
市的开端。几乎100%股民兴高采烈。但是，也有不高兴的。这
些不高兴的就是逐步建仓的股指期货 空单机构。
19月26日开始，股市成交量成直线上升，预示行情将向上突
破。事实上，作为中国股民心目中最大的心理线是3000点大
关。这个 点位已经被反复试探，到11月11日14：30分以3%
涨幅强力突破。
屡屡上涨的股市造成股指期货做空机构巨大亏损。11月合约于
11月 19日到期交割强行平仓。时间仅仅一周，如果此间股市
不能大跌，他们将面临10亿元以上亏损... 阅读全帖 |
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m**h
发帖数: 618 | 9 来自主题: MusicPlayer版 - 足球与音乐 我跟你开玩笑的。
我觉得气质这个词和追求，研究，创造没太大关系，就是指样子。比如说：某某某真是
气质美女阿！
艺术家还是应该看作品。其他的属于市场推广，当然也很重要。
我们很多大尾巴郎艺术家没有什么像样的作品，就纯靠气质，留长发戴墨镜忧郁的靠在
门框上什么的。
我理解你的意思，只不过挑一下用词。另外我也想提一下，咱们国内外不乏气质高雅天
马行空的艺术家，但是少一些匠人，匠气。其实匠人多，艺术家少，比较健康。反过来
就失去了健康发展的土壤，总是一个小圈子玩高雅。独乐乐不如众乐乐吗。我不喜欢大
家都不顾一切的追求艺术，因为这听上去太崇高，太雷锋，谁也不是傻子。我私下里觉
得，要让搞艺术的都吃上饭，别吃撑了，但是吃上，有个参照有个目标。然后才有人愿
意做艺术的，惊艳的，一出来把匠人们都盖了。
http://www.yacou.com/szz/zycr/4.htm
怎样才能做到气质美
气质是指人相对稳定的个性特征、风格以及气度。性格开朗、潇洒大方的人，往往表现
出一种聪慧的气质；性格开朗、温文尔雅，多显露出高洁的气质；性格爽直、风格豪放
的人，气质多表现为粗犷；性格温和、风度秀丽端庄，气质则表 |
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a******n
发帖数: 98 | 10 Use ANSYS to calculate the stress of a piezoelectric plate. The transverse
stresses(Szz,Sxz,Syz, where z is the thickness direction of the plate) on
the free surface where no forces and pressure are applied are not zero, and
the magnitude is not too small to be neglected. I have verified that the
displacements in three direction are correct and the mesh can not be refined
due to the node limit of this software.
I also checked other structures(nonpiezoelectric plate, beam), the
transverse str |
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a******n
发帖数: 98 | 11 Thank you for the time and efforts in answering my questions!
I tried the case of elastic plate you used. The result is better in elastic
plates. As for my problem, I have the coupled electromechanical field. My
result is not so good. The nonzero transverse normal stress Szz on the free
surface is more than 10% of the maximum value in the whole plate. I guess it
may be caused be the large electric field at that point Ez, which is
related to the calculation of stresses.
In addition, I found out t |
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a******n
发帖数: 98 | 12 Thanks for the reply.
1.I used solid226 element for the coupled field analysis. For the 3-D volume
mesh, there are nodes on the free surface. So, I evalue the stresses by
nodal value. Yes, the stresses are more accurate at Gauss points, but how
can we evaluate the Gauss point stresses in ANSYS?
2.The transverse normal stress Szz on the free surface is larger at the
location where plate deflection is larger. This might be caused by what you
said " high stress gradient". I don't know how to deal w |
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