There's a sealed (apart from a doorway) fibre glass dome with an internal radius 20ft . I need to measure the dome material thickness in various places. Any measuring instruments or ideas would be helpful.
Is there a relationship between sheer and tensile strength of bolts/screws?
Is there a chart of metric bolts/screws which will give maximum sheer strength as I've an application where I may have to use M4x0.7 fixings to support a load in sheer.
Thanks
GB