I think it should be a reasonable expectation wearing two suits of steel/kevlar armor. Studies were conducted in war torn areas that had remaining landmines from previous conflicts. Real life landmine survival rates for anti-personnel fragmentation mines is about 75%, most of which are unarmored civilians. In fact, these mines being more likely to maim than kill is part of why they were banned; since weapons designed to maim are considered unethical.
If unarmed civilians survive 3/4th of the time, heavily armored characters should be surviving more than 2/3rd of the time.