{"id":392465,"date":"2024-11-02T08:11:23","date_gmt":"2024-11-02T08:11:23","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mohr-coulomb-stress-safety-tool\/"},"modified":"2024-11-02T08:14:14","modified_gmt":"2024-11-02T08:14:14","slug":"mohr-coulomb-stress-safety-tool","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mohr-coulomb-stress-safety-tool\/","title":{"rendered":"Mohr-Coulomb Stress Safety Tool"},"content":{"rendered":"<p>&lt;p&gt;&lt;p style=&#8221;text-align: justify;&#8221;&gt;&lt;p style=&#8221;text-align: justify;&#8221;&gt;&lt;p&gt;Hello,&lt;\/p&gt;&lt;p&gt;I am conducting a geomechanical analysis on sandstone. The hole in the center denotes a wellbore. The effective minimum horizontal stress is 3.23 MPa, acting in the X-direction, while the effective maximum horizontal stress is 5.25 MPa, acting in the Y-direction. The tensile and compressive ultimate strengths of sandstone are 2.08 MPa and 47.5 MPa, respectively. The maximum hoop stress occurs in the direction of the minimum horizontal stress (X-direction). Logically, shear failure should occur in that direction as well. However, when I calculated the safety factor using the Mohr-Coulomb stress tool, I observed that failure (Safety Factor&lt;1) is occurring in the direction of the maximum horizontal stress (Y-Direction), which seems inconsistent.&lt;\/p&gt;&lt;p&gt;I would greatly appreciate any assistance in resolving this issue. Thanks in advance.&lt;\/p&gt;&lt;p&gt; &lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong>Hoop Stress<\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;<strong><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/02-11-2024-1730534371-p2.jpg\" alt=\"\" \/><\/strong>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong>Safety Factor<\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/02-11-2024-1730534455-p1.jpg\" alt=\"\" \/><\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong>Maximum Principal Stress<\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/02-11-2024-1730534614-p3.jpg\" alt=\"\" \/><\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong>Minimum Principal Stress<\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&lt;span style=&#8221;text-decoration: underline;&#8221;&gt;<strong><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/02-11-2024-1730534661-p4.jpg\" alt=\"\" \/><\/strong>&lt;\/span&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-392465","topic","type-topic","status-publish","hentry","topic-tag-ansysworkbench-ansys-staticstructural","topic-tag-brittle-failure","topic-tag-failure-criteria","topic-tag-FailureModel-1","topic-tag-mohr-coulomb-1","topic-tag-safety-factor","topic-tag-static-structural","topic-tag-StressAnalysis-1","topic-tag-stress-result"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,I am conducting a geomechanical analysis on sandstone. 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