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(3)耐衝擊性能測試 在實驗中保持落錘的衝頭質量固定不變,為5.7806kg。據專家介紹,按需要設定衝擊速度,從而獲得不同落錘高度。根據能量守恒定律,落錘瞬時最大衝擊動能為:
式中,m為落錘的質量;Vi為落錘衝擊的瞬時速度。材料損傷時吸收的能量為:
式中,Vf為落錘被板反彈後瞬時最大反向速度; 為落錘由於層合板受衝擊後彈性變形能釋放而獲得的動能。 衝擊過程中,衝擊載荷計算公式為: 式中,V(t)為速度對時間的曲線。 測試儀器:美國INSTRON公司生產的Dynatup92型材料衝擊儀。 衝頭形狀:為子彈頭狀。 將95mm×95mm方形試件放在實驗台的支持麵上,對不同鋪層的試樣進行衝擊。共分4組,每組5個試件,試驗數據取5個試樣的平均值。每組試件選取能使試件產生較大變形的入射能量的衝擊速度v。據專家介紹,由於每次人工調零的操作誤差及機器本身在衝擊過程中產生的摩擦誤差,使得v在設定的基礎上出現一定的偏差,範圍在0.8~0.9m/s之間,從而得出不同的衝擊載荷-時間及能量-時間的關係。
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