Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 31, No. 1 (January 2018) 164-172   

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  FLEXURAL AND IMPACT PROPERTIES OF STAINLESS STEEL BASED GLASS FIBRE REINFORCED FIBRE METAL LAMINATE UNDER HYGROTHERMAL CONDITIONING
 
S. Singh and S. Angra
 
( Received: October 05, 2017 – Accepted in Revised Form: November 30, 2017 )
 
 

Abstract    Fibre metal laminates (FMLs) have appeared as the most suitable materials for shipbuilding, aeronautical and aerospace applications due to their superior mechanical properties over traditional materials. In this paper, degradation in flexural and impact properties of glass fibre/epoxy composite (GF/E composite) and stainless steel glass fibre/epoxy fibre metal laminate (SS FML) due to hygrothermal conditioning has been investigated for marine applications. Hand lay-up process was used for specimen preparation according to ASTM standards. Distilled water and seawater were used for hygrothermal conditioning at 40°C and 70°C for three months. The three point bend test was performed on universal testing machine using a three point bend fixture. The pendulum type impact testing machine was used to perform Izod impact test. Due to the preventive action of outer stainless steel layers against moisture ingestion, the reduction in mechanical properties of SS FML was less as compared to GF/E composite. SS FML and GF/E composite exhibited low moisture absorption rate in seawater at both temperatures as high salt content in seawater reduces the moisture diffusion process into the composite matrix.

 

Keywords    Fibre metal laminate, Strength degradation, Mechanical properties, Hygrothermal conditioning, Moisture diffusion, Delamination

 

چکیده    ورقه های فلزی فیبری (FMLs) به دلیل خواص مکانیکی عالی آنها نسبت به مواد سنتی به عنوان یکی از مناسب ترین مواد برای ساخت و ساز کشتی، هواپیما و هوا فضا ظاهر شده اند. در این مقاله، تخریب خواص خمشی و ضربه ای کامپوزیت فیبر شیشه ای/ اپوکسی (کامپوزیتGF/E) و ورقه فلزی فیبر اپوکسی/ فیبر شیشه ای فولاد ضد زنگ (SS FML) به علت تهویه هوای هیروترمال برای کاربردهای دریایی مورد بررسی قرار گرفته است. فرایند دست کردن برای تهیه نمونه بر اساس استاندارد ASTM استفاده شده است. آب مقطر و آب دریا برای تهویه هیروترمال در دمای 40 درجه سانتیگراد و 70 درجه سانتیگراد برای سه ماه استفاده شد. آزمون خمش سه نقطه ای بر روی دستگاه تست جهانی با استفاده از سه پایه خمش نصب شد. برای انجام آزمون ضربه ایزود، دستگاه تست ضربه ای آونگ استفاده شد. با توجه به عملکرد پیشگیرانه لایه های بیرونی فولاد ضد زنگ در برابر رطوبت، کاهش خواص مکانیکی SS FML نسبت به ترکیبات GF/E کمتر بود. ترکیبات SS FML و GF/E میزان جذب رطوبت کم آب در دریا را در هر دو درجه حرارت نشان می دهد همانگونه که محتوای زیاد نمک در آب، فرایند انتشار رطوبت را در ماتریس کامپوزیت کاهش می دهد.

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