Mechanical Engineering / Makina Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/4129
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Article Citation - WoS: 24Citation - Scopus: 26Split Hopkinson Pressure Bar Compression Testing of an Aluminum Alloy: Effect of Lubricant Type(Chapman & Hall, 2003) Hall, Ian W.; Güden, MustafaThe Split Hopkinson Pressure Bar (SHPB), or Kolsky Bar, is widely used for studying the dynamic mechanical properties of metals and other materials. A cylindrical specimen is sandwiched between the incident and transmitter bars, Fig. 1, and a constant amplitude elastic wave is generated by the striker bar. Strain gages mounted on the incident and transmitter bars allow the compressive stress-strain response of the specimen to be established using uniaxial elastic wave theory [1]. A more detailed overview of SHPB testing is found in [2]. Lubricant is usually applied to the interfaces because the presence of any frictional effect on the specimen surfaces forms a multiaxial stress-state and invalidates one of the most important assumptions of the SHPB analysis, namely, a uniaxial stress state. This paper quantifies the effect for an aluminum alloy.Article Citation - WoS: 21Citation - Scopus: 25Quasi-Static and Dynamic Crushing of Empty and Foam-Filled Tubes(Springer Verlag, 2001) Hall, Ian W.; Ebil, Özgenç; Güden, Mustafa; Yu, C.-J.Metallic foam-filled tubes and their empty counterparts have been tested at quasi-static and dynamic strain rates in order to determine their energy absorption capabilities. Data from the Split-Hopkinson Pressure Bar have been used to generate force vs. displacement curves that are somewhat analogous to pseudo-engineering stress-strain curves. Force balance calculations have also been made. These results indicate that, on an equal weight basis, foam-filled tubes offer greater energy absorption capability than empty tubes at quasi-static strain rates. However, the benefit of foam filling does not appear to be extended to strain rates of the order of 200–500 s−1. Force balance calculations are shown to have potential as a method for monitoring the crushing of metallic foams at high strain rate.Article Metal Matrisli Kompozitlerin Yüksek Deformasyon Hızlarında Davranışları(TMMOB Metalurji ve Malzeme Mühendisleri Odası, 1999) Güden, Mustafa; Hall, Ian W.Süreksiz katkılarla kuvvetlendirilmiş Alüminyum Metal Matris Kompozit'lere düşük ve yüksek deformasyon hızlarında basma deneyleri uygulanmıştır. Düşük hızlarda (10'3/S) basma deneyleri instron makinasi ile yapılmıştır. Split Hopkinson Pressure Bar teknigi yüksek hızlarda (>100 Is) basma deneylerinde kullanılmıştır.Parçacık, whisker ve kısa fiberlerle kuvvetlendiriimiş farklı matris (alüminyum) alaşımlı kompozitler test edilmiştir. Kuvvetlendiricinin deformasyon hızına bağlı gerilmeye etkilerini araştırmak için kompozitlerin kuvvetlendirilmemiş matris alaşımlarıda benzer deformasyon hızlarında test edilmiştir. Kuvvetlendiricinin boyutu ve dağılımının, matris alaşımı ve uygulanan Isıl işlemin test edilen kompozitlerde deformasyon hızına bağlı gerilmeleri etkilediği bulunmuştur.