Designing and manufacturing of a drop weight impact test machine

Taheri‐Behrooz, Fathollah; Shokrieh, M.M.; Abdolvand, Hamidreza

doi:10.5267/j.esm.2013.08.001

Cited by 18 publications

(6 citation statements)

References 8 publications

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“…Although Izod and Charpy are the best known impact testing methods, they have significant drawbacks, such as the need for a notch in the specimen and limitations on the amount of load applied. For impact testing, another approach, drop weight impact testing (DWIT) [ 42 ], can be used. The energy absorption capacity of materials is measured by dropping a weight onto the specimen.…”

Section: Methodsmentioning

confidence: 99%

Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates

et al. 2021

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In this paper, the mechanical properties of fiber-reinforced epoxy laminates are experimentally tested. The relaxation behavior of carbon and glass fiber composite laminates is investigated at room temperature. In addition, the impact strength under drop-weight loading is measured. The hand lay-up technique is used to fabricate composite laminates with woven 8-ply carbon and glass fiber reinforced epoxy. Tensile tests, cyclic relaxation tests and drop weight impacts are carried out on the carbon and glass fiber-reinforced epoxy laminates. The surface release energy GIC and the related fracture toughness KIC are important characteristic properties and are therefore measured experimentally using a standard test on centre-cracked specimens. The results show that carbon fiber-reinforced epoxy laminates with high tensile strength give high cyclic relaxation performance, better than the specimens with glass fiber composite laminates. This is due to the higher strength and stiffness of carbon fiber-reinforced epoxy with 600 MPa compared to glass fiber-reinforced epoxy with 200 MPa. While glass fibers show better impact behavior than carbon fibers at impact energies between 1.9 and 2.7 J, this is due to the large amount of epoxy resin in the case of glass fiber composite laminates, while the impact behavior is different at impact energies between 2.7 and 3.4 J. The fracture toughness KIC is measured to be 192 and 31 MPa √m and the surface energy GIC is measured to be 540.6 and 31.1 kJ/m2 for carbon and glass fiber-reinforced epoxy laminates, respectively.

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Section: Methodsmentioning

confidence: 99%

Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates

et al. 2021

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“…Pengujian impak merupakan suatu upaya untuk mensimulasikan kondisi operasi material yang sering ditemui dalam perlengkapan transportasi atau konstruksi dimana beban tidak selamanya terjadi secara perlahanlahan melainkan datang secara tiba-tiba [1,2]. Untuk menampung dinamika ini perlu pengujian dalam skala besar, baik jumlah maupun dimensi.…”

Section: Kata Kunci: Uji Impak Digital Metode Charpy Materials Polimer 1 Pendahuluanunclassified

Perancangan Alat Uji Impak Digital dengan Metode Charpy Untuk Mengukur Kekuatan Material Polimer

Nuhgraha

Rosa

Agustian

2020

j. amp. : j. ilm. bid. tek. elect. and comp.

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AbstrakPada penelitian ini dilakukan pembuatan alat uji impak metode Charpy secara digital dengan menggunakan sensor rotary encoder dan mikrokontroler. Uji impak merupakan salah satu metode yang digunakan untuk mengetahui kekerasan, kekuatan serta keuletan material. Untuk mengetahui keakuratan alat uji impak yang telah dibuat maka dilakukan perbandingan antara alat uji impak otomatis dengan alat uji impak manual. Hasil pengujian menunjukkan bahwa alat uji impak digital otomatis yang dirancang memiliki performa yang lebih baik dibandingkan dengan pengujian manual.Kata kunci: uji impak digital, metode charpy, material polimer

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“…For high strain rate testing >10 3 s −1 , the split Hopkinson pressure bar (SHPB) method [21,22] is often used. In the last decade, many proven experimental techniques have been developed for high strain rate testing, e.g., compression loading, drop weight [23], SHPB [24], and gas guns [25] are regularly used. For tensile loading, the split Hopkinson tension bar (SHTB) [26][27][28], flyer plate impact test [29], and the expansion ring [30] are used.…”

Section: Introductionmentioning

confidence: 99%

Review of Intermediate Strain Rate Testing Devices

Bhujangrao

Froustey

Iriondo

et al. 2020

Metals

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Materials undergo various loading conditions during different manufacturing processes, including varying strain rates and temperatures. Research has shown that the deformation of metals and alloys during manufacturing processes such as metal forming, machining, and friction stir welding (FSW), can reach a strain rate ranging from 10−1 to 106 s−1. Hence, studying the flow behavior of materials at different strain rates is important to understanding the material response during manufacturing processes. Experimental data for a low strain rate of <101 s−1 and a high strain rate of >103 s−1 are readily available by using traditional testing devices such as a servo-hydraulic testing machine and the split Hopkinson pressure bar method, respectively. However, for the intermediate strain rate (101 to 103 s−1), very few testing devices are available. Testing the intermediate strain rate requires a demanding test regime, in which researchers have expanded the use of special instruments. This review paper describes the development and evolution of the existing intermediate strain rate testing devices. They are divided based on the loading mechanism; it includes the high-speed servo-hydraulic testing machines, hybrid testing apparatus, the drop tower, and the flywheel machine. A general description of the testing device is systematically reviewed; which includes the working principles, some critical theories, technological innovation in load measurement techniques, components of the device, basic technical assumption, and measuring techniques. In addition, some research direction on future implementation and development of an intermediate strain rate apparatus is also discussed in detail.

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Designing and manufacturing of a drop weight impact test machine

Cited by 18 publications

References 8 publications

Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates

Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates

Perancangan Alat Uji Impak Digital dengan Metode Charpy Untuk Mengukur Kekuatan Material Polimer

Review of Intermediate Strain Rate Testing Devices

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