Solver problem. Zero pivot when processing D.O.F. 1 of 49
nodes. The nodes have been identified in node set
WarnNodeSolvProbZeroPiv_1_1_1_1_1.
"msg文件中出现zero pivot说明ABAQUS无法自动解决过
约束问题，例如在桩底部的最外一圈节点上即定义了tie，又定义了contact,
出现过约束。解决方法是在选择tie或contact的slave surface时，将类型设为node region,
然后选择区域时不要包含这一圈节点。"
***WARNING:
SOLVER PROBLEM. ZERO PIVOT WHEN PROCESSING A
(TIED) CONTACT
CONSTRAINT
D.O.F. 1 FOR SLAVE NODE 885338
INSTANCE
PART-1-COPY-2-1. THIS MAY BE
DUE TO THE UNIT USED FOR THE
DISPLACEMENT DIFFERS BY MORE THAN 10 ORDER OF
MAGNITUDE THAN THE
UNIT USED
FOR THE MATERIAL STIFFNESS. IF THIS IS THE CASE,
PLEASE
USE A
DIFFERENT UNIT SYSTEM.
虽然警告消息让我改单位制，实际还是不能解决问题，最后发现还是过约束问题
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