Test method and fixture for obtaining material properties under biaxial loading

A test assembly comprising:

• a circular test coupon having a hole in a center and an outer circumference, said test coupon comprising an inner circumferential portion adjacent said hole and an outer circumferential portion adjacent said outer circumference;
• first and second reinforcing rings respectively adhered to respective surfaces of said outer circumferential portion of said test coupon;
• a coolant ring made of metal alloy and having an inner circumferential portion disposed radially outward from and surrounding said outer circumferential portion of said test coupon, said coolant ring comprising a first channel;
• and
• first and second centering rings coupled to said coolant ring, said first centering ring comprising a first annular projection in contact with said first reinforcing ring, and said second centering ring comprising a second annular projection in contact with said second reinforcing ring.

A test system comprising:

• a coolant ring made of metal alloy and comprising a central opening and a channel surrounding said central opening;
• first and second centering rings coupled to said coolant ring, said first centering ring comprising a first annular projection which projects into said central opening of said coolant ring, and said second centering ring comprising a second annular projection which projects into said central opening of said coolant ring, said first and second annular projections being separated by a gap;
• a circular test coupon disposed in said gap and held by said first and second annular projections;
• a valve in fluid communication with said channel of said coolant ring;
• and
• a source of liquid coolant in fluid communication with said valve.