As shown in Figure 13 a, the reduction in area of the SHTB exhibited an increasing trend with the increasing temperature and was much smaller than that of the high-strength bolts when the temperature exceeded 600 °C, but the opposite was true when the temperature exceeded 600 °C.
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Mechanical Properties and Stress-Strain Relationship of Grade 14.9 Superhigh-Tension Bolt (SHTB) Under Fire.
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