Damage evaluation device, damage evaluation method

A damage evaluation device that evaluates damage of equipment, the damage evaluation device comprising:

• an operation data obtaining unit, implemented by processing circuitry, which obtains operation data indicating a state of the equipment detected by a sensor disposed at a predetermined position of the equipment, the state of the equipment including a generated stress by load of the predetermined position of the equipment;
• an operating state quantity evaluation unit, implemented by the processing circuitry, which calculates an operating state quantity including at least one of temperature and the generated stress at a predetermined evaluation-target site of the equipment, based on a relational formula of the stress of the predetermined evaluation-target site of the equipment with the operating state quantity, previously created based on the operation data;
• a material deterioration evaluation unit, implemented by the processing circuitry, which calculates a material deterioration quantity of a material forming the equipment, based on the operating state quantity and material data of the predetermined evaluation-target site of the equipment;
• a risk evaluation unit, implemented by the processing circuitry, which calculates a cumulative damage quantity based on an accumulation of a creep damage quantity or a fatigue damage quantity in a unit time based on:
• a damage evaluation formula giving at least one of the creep damage quantity and the fatigue damage quantity of the evaluation-target site, given based on the operating state quantity and the material deterioration quantity;
• and
• the operating state quantity and variation information on varying stress or varying strain in the unit time in which the operating state quantity is considered constant,
• the risk evaluation unit further determining at least one of the cumulative damage quantity of the material forming the equipment and failure risk, based on the cumulative damage quantity;
• and
• a display which presents a recommended maintenance time of the equipment based on a result of a determination of the risk evaluation unit.