IJE TRANSACTIONS C: Aspects Vol. 29, No. 12 (December 2016) 1747-1756    Article in Press

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G. Majzoubi and S Moradi
( Received: December 29, 2015 – Accepted in Revised Form: September 30, 2016 )

Abstract    The ballistic response of the high strength, low alloy (HSLA-100) steel at ambient and temperatures of -400°C, -800°C and -1960°C is investigated in this work. Lambert-jonas equation is used to fit the experimental results into a curve. The effect of quenching on ballistic behavior of HSLA-100 is also studied. The experiments are conducted on 3mm thick rectangular specimens impacted by blunt tip projectiles. The results indicate that for the as-received material, the ballistic limit is nearly the same for ambient and -400°C temperatures, but increases significantly by 30% and 40% for -800°C and -1960°C temperatures, respectively. The same trend is observed for the quenched specimens. However, the increase of ballistic limit is lower for the quenched specimens and is 16% and 30% for -800°C and -1960°C temperatures, respectively. The ballistic test was also simulated using Ls-dyna hydrocode to examine the effect of parameters such as the specimen’s thickness, the projectile’s tip shape and mass on the ballistic limit of the materials.


Keywords    HSLA-100, Ballistic limit, Sub-zero temperature, Lambert-Jonas, Residual velocity


چکیده    در این تحقیق، رفتار بالستیک فولاد پرمقاومت و آلیاژ پائین HSLA-100 در دماهای محیط، 0C40-، 0C80- و 0C196- مورد مطالعه قرار می گیرد. معادله لمبرت-جونز برای برازش منحنی های بالستیک مورد استفاده قرار می گیرد. همچنین، تأثیر عملیات حرارتی کوئنچینگ بر رفتار بالستیک فولاد فوق مورد بررسی قرار خواهد گرفت. آزمایش های بالستیک بر روی نمونه های مستطیلی با ضخامت mm3 وبا استفاده از پرتابه های استوانه ای سرتخت انجام می شوند. نتایج به دست آمده نشان می دهند که حد بالستیک برای ماده دریافتی (بدون عملیات حرارتی) در دماهای محیط و0C40- تقریباً یکسان است اما برای دماهای 0C80- و 0C196- به ترتیب 30% و 40% افزایش می یابد. همین نتیجه برای نمونه های کوئنچ شده مشاهده گردید. با این حال، مقدار افزایش حد بالستیک برای نمونه های کوئنچ شده کمتر از نمونه های دریافتی بود و برای برای دماهای 0C80- و 0C196- به ترتیب 16% و 30% بود. برای بررسی پارامترهای مختلف نظیر ضخامت نمونه، هندسه سر پرتابه و جرم آن بر حد بالستیک فولاد فوق، آزمایش بالستیک با استفاده از نرم افزار Ls-dyna شبیه سازی گردید.


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