Many thanks to one of our diligent readers for finding the following error in our free textbook.

On page 83 of our textbook, there is a method for the pull-through strength of a bolt in a composite laminate. This contains an error with regard to the definition of the parameter ‘D’. A corrected version of the text is below:

The spreadsheet for this method has been updated and Revision B is available here

The error in the method resulted in generally conservative results. However, please let your colleagues and contacts know that there was an error in this method and they need to update any work.

This will be corrected in the third edition of the textbook.