Bolt Static Analysis v1.4.0

• Corrected a bug whereby if there were 2 bolt groups with the same plates stack, and the user modified the plate order in one group, the change would be applied to the other group as well

 

• Added a Duplicate plate option to the right click menu of the plates list
• Modified the plate summary label to contain 2 decimal places for the plate thickness and distance to edge

 

• Added a joint diagram drawing for each bolt group, into the report

Bolt Static Analysis v1.2.0 – Comprehensive analysis

• Various changes to parameters notation, both in the user interface and in the report, to improve consistency between them

 

• Eliminated the bolt group parameters for Minimum distance of bolt hole to flange edge and Minimum distance of bolt hole to counterpart edge. This information was moved to become an individual parameter for each plate. When loading a BSA file generated with a previous version, it will automatically be updated as follows:
  
  
  • The Minimum distance of bolt hole to flange edge will be assigned as Bolt hole to plate edge for all plates except the bottom one
  • The Minimum distance of bolt hole to counterpart edge will be assigned as Bolt hole to plate edge for the last plate in the stack (the bottom plate)

 

• Updated the report to include the new parameter for Bolt hole to plate edge, for every plate

 

• Added a control to enable the user to override the number of contact areas between the plates. When set to 0 (default) the number of contact areas is automatically calculated as the number of plates - 1

 

• Added the possibility to specify the bolt preload either as:
  • the fraction of bolt tensile yield stress to be reached when the bolt is loaded (also known as coefficient of utility) or
  • the nominal installation torque at reference temperature

 

• Updated the pop-up message shown when the user loads a BSA file created with an older version. Now the message displays a detailed list of the changes made (if any) in order to update the file to the latest version

 

• Corrected the calculation of margin of safety for thread pull-out () to use maximum preload including thermal load instead of maximum preload without thermal load

Previous calculation :

Current calculation :

where

	Critical fastener load for failure of thread (minimum between male and female thread)
	Maximum preload without thermal load
	Maximum preload including thermal load
	Joint stiffness ratio which accounts for bolt loading plane factor
	Derived maximum external axial bolt load, when moments loads are considered
	Ultimate safety factor

 

• Corrected the calculation of necessary length of the engaged thread ()

Previous calculation :

Current calculation :

where

	Critical fastener load for failure of thread (minimum between male and female thread)
	Axial load transmitted by the thread
	Bolt thread pitch
	Bolt major diameter
	Bolt pitch diameter
	Bolt thread angle
	Minor diameter of the female thread
	Empirical coefficient accounting for the depth of supporting material behind the female thread
	Empirical coefficient accounting for the strength ratio of the two threads
	Shear ultimate strength of the bolt material
	Shear ultimate strength of the material forming the female thread. Equal to: Shear ultimate strength of nut material if counterpart is a nut Shear ultimate strength of last plate material if counterpart is threaded insert Shear yield strength of helicoil material if counterpart is threaded insert with helicoil

 

• Corrected the calculation of margin of safety on fastener failure for combined loads, yield ()

Previous calculation :

Current calculation :

where

	Fastener strength utilization ratio (axial, yield)
	Fastener strength utilization ratio (shear, yield)

 

• Corrected the calculation of margin of safety on fastener failure for combined loads, ultimate ()

Previous calculation :

Current calculation :

where

	Fastener strength utilization ratio (axial, ultimate)
	Fastener strength utilization ratio (shear, ultimate)

 

• Corrected the calculation of margin of safety on plate hole bearing stress, yield () for every plate (i = plate index)

Previous calculation :

Current calculation :

where

	Bearing yield of plate i, linearly interpolated between and
	Nominal bolt hole diameter of plate i
	Bolt major diameter
	Thickness of plate i
	Derived maximum radial bolt load, when moments loads are considered
	Yield safety factor
	Joint fitting safety factor

 

• Corrected the calculation of margin of safety on plate hole bearing stress, ultimate () for every plate (i = plate index)

Previous calculation :

Current calculation :

where

	Bearing ultimate of plate i, linearly interpolated between and
	Nominal bolt hole diameter of plate i
	Bolt major diameter
	Thickness of plate i
	Derived maximum radial bolt load, when moments loads are considered
	Ultimate safety factor
	Joint fitting safety factor

 

• Corrected a bug in the representation of the compression zone, in the bolted joint drawing, whereby when this was a full sleeve the compression zone would extend beyond the counterpart or nut. This bug only affected the visual representation of the compression zone and not the calculations.

Bolt Static Analysis v1.3.0

• Corrected a bug whereby in certain cases data was not loaded correctly from F06 and PCH files

 

• Added the possibility to export the complete Margin of Safety (MoS) values calculated by MARS for a particular analysis, into a CSV file. This is the dataset out of which the minimum MoS values presented in the report are obtained

 

• Added the possibility to export a list of all analysis scenarios, into a CSV file. This is essentially the data in the Load Data tab with an additional column for the bolt group name

 

• Added support for loading CBEAM datasets from .F06 and .PCH files

 

• Added a diagram in the user manual to describe the calculation process for the Margins of Safety presented in the report

 

• Added a window to display progress to the user while scanning for datasets in load data files

Bolt Static Analysis v1.1.0 – Comprehensive analysis

• Introduced the possibility to visualize a drawing of the bolted joint together with the calculated compression cone, by right-clicking on a bolt group and selecting View joint drawing. This helps to double-check the setup before the analysis and more easily spot possible mistakes in the inputs.

• Corrected the calculation of the compression cone when the counterpart is a plate with threaded insert (with or without helicoil) and is narrow enough to be considered as a nut, to consider the possible presence of a washer with external diameter bigger than that of the bolt head.

• Corrected the calculation of the compression cone parameters such that if a partially developed cone is obtained but the cone does not actually sit outside any of the plates, then it is switched to a fully developed cone. Due to this change the compression cone half angle is sometimes calculated based on the plate with the maximum diameter.

• Other minor corrections to the calculation of the compression cone.

• Corrected the calculation of the plates’ compliance to consider the bottom plate in all situations. Previously the bottom plate was not considered in certain situations.

• Corrected a bug whereby if Both was selected for washer setup and then the counterpart type was changed from nut to threaded insert, the washer setup selection was adjusted in the MARS window without also updating the analysis data.