誰知道abaqus零主軸怎么辦，求求各位大神指導

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Solver problem. Zero pivot when processing D.O.F. 3 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_2_1_1_1.

Solver problem. Zero pivot when processing D.O.F. 3 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_2_1_1_4.

Solver problem. Zero pivot when processing D.O.F. 3 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_2_1_1_5.

<Warning><message type="string">Solver problem. Zero pivot when processing D.O.F. 3 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_2_1_1_1.</message><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Warning>

<Status><step type="integer">2</step><increment type="integer">1</increment><attempts type="string"> 1U</attempts><severe type="integer">8</severe><equilibrium type="integer">0</equilibrium><iterations type="integer">8</iterations><totalTime type="float">1</totalTime><stepTime type="float">0</stepTime><timeIncrement type="float">1</timeIncrement><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Status>

<Status><step type="integer">2</step><increment type="integer">1</increment><attempts type="string"> 2U</attempts><severe type="integer">13</severe><equilibrium type="integer">0</equilibrium><iterations type="integer">13</iterations><totalTime type="float">1</totalTime><stepTime type="float">0</stepTime><timeIncrement type="float">0.25</timeIncrement><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Status>

<Status><step type="integer">2</step><increment type="integer">1</increment><attempts type="string"> 3U</attempts><severe type="integer">13</severe><equilibrium type="integer">0</equilibrium><iterations type="integer">13</iterations><totalTime type="float">1</totalTime><stepTime type="float">0</stepTime><timeIncrement type="float">0.0625</timeIncrement><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Status>

<Warning><message type="string">Solver problem. Zero pivot when processing D.O.F. 3 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_2_1_1_4.</message><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Warning>

<Status><step type="integer">2</step><increment type="integer">1</increment><attempts type="string"> 4U</attempts><severe type="integer">13</severe><equilibrium type="integer">0</equilibrium><iterations type="integer">13</iterations><totalTime type="float">1</totalTime><stepTime type="float">0</stepTime><timeIncrement type="float">0.015625</timeIncrement><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Status>

<Warning><message type="string">Solver problem. Zero pivot when processing D.O.F. 3 of 1 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_2_1_1_5.</message><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Warning>

<Error><message type="string">Process terminated by external request (SIGTERM or SIGINT received).</message><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Error>

<Interrupted><message type="string">Analysis interrupted by external signal</message><phase type="symconst">STANDARD_PHASE</phase><jobName type="string">Job-77zyf</jobName></Interrupted>

<ERROR><message type="string">Abaqus/Standard Analysis exited with an error - Please see the message file for possible error messages if the file exists.</message><jobName type="string">Job-77zyf</jobName></ERROR><JOB_RTED><message type="string">Abaqus/Standard Analysis exited with an error - Please see the message file for possible error messages if the file exists.</message><jobName type="string">Job-77zyf</jobName></JOB_RTED></msgwrapper>