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Decay of Pretension due to Transverse Excitation

Altair Forum User

Hello All,

I'm PG student working for my thesis. I am trying to study the self-loosening behavior of bolted assembly under the effect of transverse excitation.

Kindly refer the attached image for reference. looking for guidance for the same as earliest.

We have given frictional contact at each contact interface & pretension is applied. BC's applied are 'Direct transient (Force Excitation)'. The self loosening phenomenon can be understood by monitoring the 'Pretension vs time graph'

1. How to generate request for 'Pretension vs time graph' ?

2. There are few errors are coming across for transient output request. Is there any sample deck for it ?

<?xml version="1.0" encoding="UTF-8"?>

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Rahul Rajan_21763

You can refer to the below video for bolt pretension using OptiStruct.

OptiStruct Nonlinear Learning Center

Unable to find an attachment - read this blog

SuyashS

Hello All,

I'm PG student working for my thesis. I am trying to study the self-loosening behavior of bolted assembly under the effect of transverse excitation.

Kindly refer the attached image for reference. looking for guidance for the same as earliest.

We have given frictional contact at each contact interface & pretension is applied. BC's applied are 'Direct transient (Force Excitation)'. The self loosening phenomenon can be understood by monitoring the 'Pretension vs time graph'

1. How to generate request for 'Pretension vs time graph' ?

2. There are few errors are coming across for transient output request. Is there any sample deck for it ?

<?xml version="1.0" encoding="UTF-8"?>

Hi,

Were you able to get this to work?

You can plot pre-tension vs time by selecting PRETBOLT under the GLOBAL OUTPUT REQUEST. Select OPTI as the format under PRETBOLT and make sure that the OPTI is added as a format in the FORMAT control card.

Hope this helps.

Suyash