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Re: [Question #293669]: shear Force in a cohesive contact

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: behzad <question293669@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 13 May 2016 23:32:30 -0000
Reply-to: question293669@xxxxxxxxxxxxxxxxxxxxx
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Question #293669 on Yade changed:
https://answers.launchpad.net/yade/+question/293669

    Status: Answered => Open

behzad is still having a problem:
one update:

if I remove the following piece of the code, it behaves as expected.

      const Real maxFs = phys.normalForce.squaredNorm() * std::pow(phys.tangensOfFrictionAngle,2);
      if( phys.shearForce.squaredNorm() > maxFs ) {
		  
        const Real ratio = sqrt(maxFs) / phys.shearForce.norm();
        phys.shearForce *= ratio;
      }


AFAIK, this piece controls the shear force. Do I need this is this type of contact? 
By applying the force as explained in #1, the contact cohesion is not being broken, the force only moves the upper sphere and so contact point is moving.

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