12 CONTACT PAIR (ASSEMBLY_BLANKBOT,ASSEMBLY_TIE-1_DIEDURF) NODE BLANK-1.5 IS OVERCLOSED
BY 0.0512228 WHICH IS TOO SEVERE
这往往是因为接触面的法线方向定义反了。定义刚体和shell的surface时,要注意选择外侧
13 123456 elements are distorted。Excessive distortion of element number 5 of instance PART-1-1
如果有子程序,一般不是材料设置有问题,就是边界条件的问题
14 XML parsing failure for job 1. Shutting down socket and terminating all further messages. Please check
the .log, .dat, .sta, or .msg files for information about the status of the job.
http://forum.simwe.com/viewthrea ... 26amp;typeid=68
15 The number of history output requests in this ABAQUS analysis (>5000) may cause SIGNIFICANT performance problems during analysis and
postprocessing 输出项太多,恐硬件资源不够。要是你确保硬件够,这条也不怕了。一般的,应该减少History中的输出项,尽量输出你最感兴趣的内容。 16 Value for parameter nset will be truncated to 80 characters nset名字取太长了,80字符限制 17 compilation - ifort.exe 问题
Problem during compilation - ifort.exe not found in PATH.
安装的时候没有装好或是二次开发版本冲突。检查环境变量的设置;然后 verify一下,看看是子程序功能否能通过? C系列
如上所说,有很多warning并一定意味着你的模型存在问题。常被问起的有: 1 负特征值问题
THE SYSTEM MATRIX HAS 8 NEGATIVE EIGENVALUES.
负特征值是非线性分析的必然产物。所以不必大惊小怪,甚至久而久之,对于你熟悉的问题,你都会视而不见了。若出了问题,可先检查下有没有伴随的 numerical sigularity(数值奇异)和 Zero pivot(零主元)产生。如果没有,可以参考这几个方面: 1).刚体位移
2).单元异常,过度变形、过度扭曲等 3).应力应变关系有负斜率
4)如果有流体的话,在容器发生形变的话,也可能出现negative eigenvalue 的情况,不过不会出现警告,这是被允许的 5)失稳发生
2 The ratio of deformation speed to wave speed exceeds 1.0000 这个警告是指单元形变速度V(单元最大形变率/特征尺寸)和膨胀波速C (通过材料本构关系求得)的比例超过1。 解决这个问题的方案有以下几种:
(1)检查单位是否封闭(参数设置有数量级的错误),此错误新手常犯; (2) 检查网格质量 ;
(3) 检查加载速度,如果条件允许的话就降低速度,该方法也很有效,但在很多 情况下无法降低速度;
(4) 调整STEP中的TIME SCALING FACTOR;调整STEP中的 MASS SCALING FACTOR;
(5) 加*SECTION CONTROLS,NAME=SC,DISTORTION CONTROL, LENGTH RATION=0.1 或者YES也可以,加在MATERIAL 前面;或加* DIAGNOSTICS, DEFORMATION SPEED CHECK=OFF;
或者加*DIAGNOSTICS, CUTOFF RATIO=RATIO(具体数值),在其他 方法修改后还有问题的的情况下使用增加
关键字的方法见http://forum.simwe.com/thread-862510-1-1.html(17楼)
3 zero force/ZERO MOMENT问题
THERE IS ZERO MOMENT EVERYWHERE IN THE MODEL BASED ON THE DEFAULT CRITERION. PLEASE CHECK THE VALUE OF THE AVERAGE MOMENT DURING THE CURRENT ITERATION TO VERIFY THAT THE MOMENT IS SMALL ENOUGH TO BE TREATED AS ZERO. IF NOT, PLEASE USE THE SOLUTION CONTROLS TO RESET THE CRITERION FOR ZERO MOMENT.
这个警告是告诉你模型中没有弯矩,没问题的,可以继续计算。 如果提示中出现特征值奇异的时候才是计算有可能出现不收敛的问题。 4 Degree of freedom 4 is not active in this model and can not be restrained 有限元软件计算对于实体步考虑转动自由度,所以你在边界条件中限制了456的自由度后,软件会忽略的啊.
5 The option *boundary,type=displacement has been used; check status file between steps for warnings on any jumps
prescribed across the steps in displacement values of translational dof. For rotational dof make sure that there are
no such jumps.All jumps in displacements across steps are ignored. 你采用了位移边界条件,但在平动自由度上,可能在不同的分析步骤里面有突变(你可以从sta文件里面查看),
并且应保证转动自由度无突变。通知性质的warning,一般是因为你采用位移加载方式,都出这个。
6 The strain increment has exceeded fifty times the strain to cause first yield at 377 points 检查下约束够不够,约束够了就不用管了,这只是通知你,你的模型塑性应变很大,一般没多大问题。
7 123 nodes are used more than once as a slave node in *TIE keyword.One of the *TIE constraints at each of these
nodes have been identified in node set WarNodeOverconTieSlave 定义接触的时候,公共节点重复定义了好几次,这样可能会出现过约束问题(只是可能影响)..
8 There are 2 unconnected regions in the model.
可能是接触面由空隙,最好在接触属性中定义一个容差范围。一般各个parts之间定义接触,aba都会这样通知用户的,只要接触设置对了,一般没事。 9 Boundary conditions are specified on inactive dof of 124 nodes. The nodes have been identified in node set WarnNodeBCIactiveDof 边界条件定义的有问题:在124个节点的非自由度上有边界加载
10 The plasticity/creep/connector friction algorithm did not converg 一般是塑性应变太大,单元扭曲导致的。可以先改为弹性模型看看是否收敛; 11 The ratio of the maximum incremental adjustment to the average characteristic
length is 1.82846e-02 at node 10868 instance jiti1 on the surface pair (assembly_jq22,assembly_q22).
可以通过调大预设值消除该提示and检查网格质量。
12 ELEMENT 42 INSTANCE SOIL3-1 IS DISTORTING SO MUCH THAT IT TURNS 应改进单元质量
13 650 nodes are either missing intersection with their respective master surface or outside the adjust zone. 改改tie里的tolarance试试
14 Dependent part instances cannot be edited or assigned mesh attributes 模型树--assembly-打击part 右键--make independent。也可以到模型树part步展开点mesh。
15 The aspet ratio for nnn elements exceeds 100 to 1.
单元划分网格长宽比不合适。如果这些单元在不重要的区域(对结果肯定有些影响, 影响大小取决于这三个单元的位置,在模型中的作用等),而且能计算,那就没问题了
16 123 elements are distorted
存在单元扭曲,如果这些单元在不重要的区域(对结果肯定有些影响,
影响大小取决于这三个单元的位置,在模型中的作用等),而且能计算,那就没问题了(同15)
17 ***WARNING: DEGREE OF FREEDOM 1 IS NOT ACTIVE ON NODE 6 - THIS BOUNDARY CONDITION IS IGNORED
约束了单元没有得自由度对求解没有影响,可以查看下
18 热分析时出现了这样的警告“THERE IS ZERO HEAT FLUX EVERYWHERE There is zero HEAT FLUX everywhere in the model based on the default criterion. please check the value of the
average HEAT FLUX during the current iteration to verify that the HEAT FLUX is small enough to be treated as zero.
if not, please use the solution controls to reset the criterion for zero HEAT FLUX. 试试:
(1)是不是热源定义的问题,错误信息是说热源量几乎为零。
(2)定义热源的子程序调用命令流应该为*HEAT GENERATION,在材料模块中定义,子程序为HETVAL。
19 The elements in the element set WarnElemSurfaceIntersect-Step1 are involved surface intersections. Refer to the status and message file for further details
检查一下你单元集合的定义以及面的定义,看是否出现了相交或重复定义的情况 20 Boundary conditions are specified on inactive dof of 36 nodes. The nodes have been identified in node set WarnNodeBCInactiveDof.
21 Integration and section point output variables will not be output for deformable elements that are declared as rigid using the *rigid body option
这个仅是通知性质的(在interaction步设置为rigid body,不输出应力应变),你在interaction步定义了刚体约束的话,都会出这个警告。
22 For a self contact surface, the facets of the elements in element set WarnElemFacetThickPt63d-Step1 are thicker than 0.6 times