EFFECT OF HEAT TREATMENT AND CROSS SECTION ON THE CRASHWORTHINESS OF 51CRV4 SPRING STEEL

Abstract

In this study, the 51CrV4 spring steel was used as crash box material and its crashworthiness was investigated. Crash boxes with cylinder and rectangular geometries were designed in SolidWorks and nonlinear finite-element analysis was performed in HyperWorks software. In addition, 51CrV4 spring steel was subjected to three different heat treatments and their mechanical properties were determined by tensile and hardness tests. The crashworthiness of structure was evaluated taking into account the total energy absorbed, peak force and the specific energy absorbed. It has been observed that heat treatment and geometric changes have a serious impact on crashworthiness.

Keywords

• Thin-Walled Tubes,Crashworthiness,Mechanical Strength,Crash Box

51CrV4 Yay Çeliğinde Isıl Işlem ve Kesit Geometrisinin Çarpışma Dayanıklılığı Üzerine Etkisi

Abstract

Bu çalışmada, 51CrV4 yay çeliği çarpışma kutusu malzemesi olarak kullanılmış ve çarpışma dayanıklılığı araştırılmıştır. Kare ve silindir kesit geometrisine sahip çarpışma kutuları SolidWorks programında tasarlanmış olup lineer olmayan sonlu elemanlar analizi ise HyperWorks yazılımında gerçekleştirilmiştir. Buna ek olarak, 51CrV4 çelik malzemesi 3 farklı ısıl işleme maruz bırakılarak mekanik özellikleri çekme ve sertlik testleri ile belirlenmiştir. Belirlenen mekanik özelliklere sahip yapının çarpışma dayanıklılığı, emilen özgül enerji, maksimum çarpışma kuvveti ve emilen toplam enerji hesaba katılarak değerlendirilmiştir. Isıl işlem uygulamasının ve kesit geometrisinin çarpışma dayanıklılığı üzerinde ciddi bir etkisi olduğu gözlemlenmiştir.

Keywords

• Ince-Cidarlı Tüpler,Çarpışma Dayanıklılığı,Mekanik Dayanım,Çarpışma Kutusu

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