ﺑﺮرﺳﯽ ﺗﺠﺮﺑﯽ و ﻋﺪدي ﺧﻮاص ﻣﮑﺎﻧﯿﮑﯽ رﻓﺘﺎر ﺧﻤﺶ و ﻓﺸﺎر ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ اﻟﯿﺎف ﮐﺮﺑﻦ / اﭘﻮﮐﺴ ﯽ ﺑﺎ ﻫﺴﺘﻪ ﺟﺪ ﯾﺪ M ﺷﮑﻞ

Experimental and Numerical Investigation on Mechanical Properties of Bending and Compressive Behaviour of Carbon-Epoxy Sandwich Panel with Novel M-Shaped Core

ﻣﻘﺎﻟﻪ ﺣﺎﺿﺮ ﺑﺎ روﯾﮑﺮد ﺗﺠﺮﺑﯽ و ﻋﺪدي رﻓﺘﺎر ﻣﮑﺎﻧﯿﮑﯽ ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ ﮐﺎﻣﭙﻮزﯾﺘﯽ ﺑﺎ ﻫﺴﺘﻪ ﺟﺪﯾﺪ ﻣﺸﺒﮏ M ﺷﮑﻞ را ﺑﺮرﺳﯽ ﮐﺮده اﺳﺖ ﮐﻪ ﺗﺤﺖ ﺑﺎرﻫﺎي ﺧﻤﺸ ﯽ ﺳﻪ ﻧﻘﻄﻪاي و ﻓﺸﺎري ﻗﺮار دارد. ﺑﺮاي ا ﯾﻦ ﻣﻨﻈﻮر، در اﯾﻦ آزﻣﺎﯾﺶ ﯾﮏ ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ ﮐﺎﻣﭙﻮزﯾﺘﯽ ﺑﺎ ﻫﺴﺘﻪ M ﺷﮑﻞ از اﻟﯿﺎف ﮐﺮﺑﻦ ﺳﺎﺧﺘﻪ ﺷﺪه اﺳﺖ. ﺑﺮاي ﺳﺎﺧﺖ ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ ﻫﺎ، از روش ﻗﺎﻟﺐ اﻧﺘﻘﺎل رزﯾﻦ ﺑﻪ ﮐﻤﮏ ﺧﻼ )VARTM( ﺑﺮاي دﺳﺘﯿﺎﺑﯽ ﺑﻪ ﯾﮏ ورﻗﻪ )ﻟﻤﯿﻨﯿﺖ( ﻋﺎري از ﻫﺮﮔﻮﻧﻪ ﻧﻘﺼﯽ اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. ﭘﺲ از آن، ﻓﻮم ﭘﻠﯽ اورﺗﺎن ﺑﺎ ﭼﮕﺎﻟﯽ 80 ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﻣﺘﺮ ﻣﮑﻌﺐ ﺑﻪ ﻫﺴﺘﻪ ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ ﺗﺰرﯾﻖ ﺷﺪه اﺳﺖ. ﺳﭙﺲ، ﯾﮏ ﻃﺮاﺣﯽ ﻣﻨﺤﺼﺮ ﺑﻪ ﻓﺮد ﺑﺮاي ﻫﺴﺘﻪ ﻫﺎي ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ اراﺋﻪ ﺷﺪه اﺳﺖ. ﻣﻄﺎﻟﻌﻪ ﻣﻨﺤﻨﯽ ﻫﺎي ﻧﯿﺮو ﺑﺮﺣﺴﺐ ﺟﺎﺑﺠﺎﯾﯽ ﺑﻪ دﺳﺖ آﻣﺪه از آزﻣﻮن ﻫﺎي ﻓﺸﺎر و ﺧﻤﺶ ﺳﻪ ﻧﻘﻄﻪاي ﺑﺮ ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ ﻧﺸﺎن داد ﮐﻪ ﺳﺎﻧﺪوﯾﭻ ﭘﺎﻧﻞ درﺣﺎﻟﯽ ﮐﻪ ﺳﺒﮏ اﺳﺖ، از ﯾﮏ ﻣﻘﺎوﻣﺖ ﻣﮑﺎﻧﯿﮑﯽ ﻣﻄﻠﻮب ﺑﺮﺧﻮردار اﺳﺖ. ﻻزم ﺑﻪ ذﮐﺮ اﺳ ﺖ ﮐﻪ داده ﻫﺎي ﺗﺠﺮﺑﯽ ﺑﺎ ﻧﺘﺎﯾﺞ ﺷﺒﯿﻪﺳﺎزي ﻋﺪدي در ﻧﺮم اﻓﺰا ر آﺑﺎﮐﻮس ﻣﻘﺎﯾﺴﻪ ﮔﺮدﯾﺪ و ﻣﺸﺨﺺ ﺷﺪ ﮐﻪ ﻧﺘﺎﯾﺞ ﻋﺪدي ﺑﺎ ﻧﺘﺎﯾﺞ ﺗﺠﺮﺑﯽ ﻣﻄﺎﺑﻘﺖ ﺧﻮﺑﯽ دارﻧﺪ؛ ﻟﺬا اﻣﮑﺎن اﺳﺘﻔﺎده از ﺷﺒﯿﻪﺳﺎزي ﻋﺪدي ﺑﻪ ﺟﺎي روش ﻫﺎي ﺗﺠﺮﺑﯽ وﻗﺖﮔﯿﺮ را ﺑﺮاي ﻃﺮاﺣﯽ و ﺗﺠﺰﯾﻪ و ﺗﺤﻠﯿﻞ ﻓﺮاﻫﻢ ﻣﯽ ﮐﻨﺪ.

Present paper has experimentally and numerically investigated the mechanical behaviour of composite sandwich panel with novel M-shaped lattice core subjected to three-point bending and compressive loads. For this purpose, a composite sandwich panel with M-shaped core made of carbon fiber has been fabricated in this experiment. In order to fabricate the sandwich panels, the vacuum assisted resin transfer molding (VARTM) has been used to achieve a laminate without any fault. Afterward, polyurethane foam with density of 80 Kg/m3 has been injected into the core of the sandwich panel. Then, a unique design was presented to sandwich panel cores. The study of force-displacement curves obtained from sandwich panel compression and three-point bending tests, showed that an optimum mechanical strength with a considerable lightweight. It should be noted that the experimental data was compared to numerical simulation in ABAQUS software and it turned out that numerical results are in good agreement with experimental ones and make it possible to use simulation instead of time-consuming experimental procedures for design and analysis.