Buckling Characteristics of Different Cross-Sectioned LGFR-PP Stiffeners under Axial Compression

Long glass fiber-reinforced polypropylene (LGFR-PP) composite structures with stiffeners are important substitutes for metal parts vehicle lightweighting; a good understanding of the buckling characteristics LGFR-PP would provide an reference engineering design. The current work is therefore intended to study different cross-sectioned under axial compression via experimental and theoretical analysis. Firstly, semicircular, rectangular, trapeziform cross-sections were compressed at direction using universal testing machine obtain process data. Then, elasticity stability theory modified according results was derived estimate resistance in designs. test showed that possessed flexible–torsional bulking instability mode compression, semicircular cross-section had higher resistance, rectangular better rigidity. analysis could generally predict compression.