Methods and apparatus to perform load measurements on flexible substrates

A flexible substrate testing system, comprising:

• a first plate comprising a first surface configured to hold a first side of a flexible substrate under test;
• a first translation linkage configured to hold the first plate and to limit motion of the second plate in directions parallel to the first surface of the first plate;
• a second plate comprising a second surface configured to hold a second side of the flexible substrate;
• a second translation linkage configured to hold the second plate and to limit motion of the second plate in directions parallel to the second surface of the second plate;
• one or more actuators configured to move the first and second plates at respective angles to fold the substrate to an angle greater than 0 degrees and less than or equal to 180 degrees;
• and
• load cells configured to measure loads on the first plate and the second plate while the actuator moves the first plate and the second plate.