Loading rates typical are 1.5 Mpa per minute, depending what the panel is used for and what you are looking at. During research I suggest you start of with deflection control at about 0.3 mm/minute and calculate the area under the graph to give you an enrgy absorption figure?

1.5 MPa per minute.

You can apply 1.5 Mpa per minute. Please mention the panel size. 

Dear Attar

Panel Dimensions:

Length:480mm

Width:180mm

Depth:30mm

Kind Regards

I understand that this is four-point bending. I agree with given answers, i.e. first read the appropriate code, and second, use 1.5 MPa per minute.

i think You can Initially apply 0.5-1 Mpa per minute.