EFFECT OF LOCAL CORROSION ON MECHANICAL PROPERTIES OF THE POROUS STRUCTURE

Dichloromethane solution was introduced as the corrosion medium by the liquid drop method.Based on the regular quadrilateral, regular hexagon and concave structures with different porosities，the effects of different corrosion cycles and areas on the porous structural mechanical properties of polylactic acid (PLA) were analyzed by comparing with the finite element simulation results.The results show that concave porous structure plate is the least affected by the corrosion cycle, while the other two structures are affected by it depending on the size of the porosity.The hexagonal structure with a porosity of 72% has the weakest corrosion defect bearing capacity, while the concave structure has the strongest bearing capacity.The regular quadrilateral structure with a porosity of 54% is most affected by the single cell corrosion.The corrosion bearing capacity of the expanded area of a single cell in a regular hexagonal structure is weaker than that of a single cell, while the corrosion bearing capacity of the expanded area of a single cell in a regular quadrilateral structure is stronger than that of a single cell.