Depth of Penetration Behaviour Analysis of Tungsten Long-Rod Penetrator Impacting on Armour Steel by Penetration Models

Öz

The penetration behavior of Tungsten long rod penetrators on RHA (Rolled-homogenous Armor) steels is very important for vulnerability analysis and ballistic efficiency determination of armor systems. Within the scope of the study, the penetration of Tungsten long rod penetrators with different length to diameter ratios (L/D) on semi-infinite RHA armor steels with various impact velocities between 665-3500 m/s was calculated by using empirical and analytical models. In order to make these calculations, a program was written in Python coding language. Material properties, impact velocity and geometric properties were used as inputs while the penetration depth was obtained as an output. Calculated penetration values were compared with test results for 150 different data points. Also, calculation errors between experimental and empirical/analytical models were determined. It has been found that the error rate was low, especially for the lower L/D values where empirical equations are valid, but for empirical equation which is valid for greater L/D range (10-30) only 9% error rate was achieved. In addition, it was determined that the error rate of the Aleksiveeskii-Tate penetration model increased as the L/D ratio increased, while the Walker-Anderson penetration model gave the closest values to the experimental results for each L/D value and the error rate did not increase even though the L/D values increased.

Anahtar Kelimeler

• Tungsten long-rod penetration
• High Velocity Impact
• RHA Steel
• Penetration Mechanics

Tungsten Uzun Çubuk Tipi Penetratörlerin Zırh Çelikleri Üzerindeki Delme Etkinliğinin Penetrasyon Modeller ile İncelenmesi

Öz

Uzun çubuk tipi Tungsten penetratörlerin RHA (haddelenmiş homojen) zırh çelikleri üzerine yüksek hız ile çarpması esnasında oluşturduğu penetrasyon zırh sistemlerinin zafiyet analizleri ve balistik verimlerinin belirlenmesi için çok önemlidir. Çalışma kapsamında farklı boy/çap oranlarına (L/D) sahip Tungsten uzun çubuk penetratörlerin yarı sonlu RHA zırh çelikleri üzerinde 665-3500m/s çarpma hızı aralığındaki penetrasyonunu ampirik ve analitik modeller kullanılarak hesaplanmıştır. Bu hesaplamaların yapılabilmesi için Python kodlama dilinde program yazılarak malzeme bilgileri, çarpma hızı ve geometrik özellikleri girdi olarak kullanılmış delme derinliği çıktı olarak elde edilmiştir. Gerçekleştirilen hesaplama sonuçları 150 adet farklı veri noktasını içeren test sonuçları ile karşılaştırılmıştır. Karşılaştırma çalışmaları kapsamında ampirik ve analitik modellerin hesaplama hataları belirlenmiştir. Özellikle ampirik denklemlerin geçerli olduğu L/D değeri için hata oranın düşük olduğu fakat geniş L/D aralığı (10-30) için %9 hata değerine sahip olduğu belirlenmiştir. Bunun yanında Aleksiveeski-Tate modelinin L/D oranı artıkça hata oranının artığı, Walker-Anderson penetrasyon modelinin ise hem tüm L/D değerleri için deney sonuçlarına en yakın değerlerini verdiği hem de L/D değerleri artmasına rağmen hata oranın artmadığı belirlenmiştir.

Anahtar Kelimeler

• Uzun çubuk tipi tungsten penetratör
• Yüksek hız penetrasyonu
• RHA Zırh Çeliği
• Penetrasyon mekaniği

Kaynakça

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