Progress in the Instrumented Charpy Impact Test

Abstract

It has passed one century since French G. Charpy proposed the Charpy impact test in 1901. Instrumented impact test recording load history during fracture has been attempted since 1920's. It has become possible to obtain various information from this method. However, succeeding development of fracture mechanics has made it also as a qualitative screening test. To obtain quantitative fracture toughness parameters from this method, therefore, has been desired eagerly. The author developed successfully a computer aided dynamic fracture toughness evaluation system , called CAI system already in 1980's. This paper reviews development and progress in the Charpy test, especially focusing on problems of evaluation of dynamic fracture toughness by the Instrumented impact test and on accuracy of measurement in the test.

Calculation of transient strain energy release rates under impact loading based on the virtual crack closure technique

“…The Charpy or drop weight test of pre-cracked specimens is used extensively for dynamic fracture toughness determination over a wide range of impact velocities [36]. It is known that the inertia effects become significant when the specimens are subjected to impact loading and must be taken into account in analysis.…”

Impact Properties of Austempered Spheroidal Graphite Cast Irons

“…It is observed in the case of ADI specimen when notched but it is not observed when without notch process. From this result, absorbed energy (En) in impact test could separate the crack initiation energy (Ei) and the crack propagation energy (Ep) for various matrix specimens [17]. Figure 12 shows the relation between the impact characteristics of these various matrix tested at room temperature.…”

Analisis Pengaruh Variasi Heat Input terhadap Uji Impact, Uji Metalografi, dan Laju Korosi pada Pengelasan SMAW Sambungan Pelat Baja A36 dengan Baja Structural Steel 400 (SS400)

“…ENGELASAN sering digunakan dalam proses fabrikasi struktur baja seperti konstruksi teknik sipil, konstruksi pelat kapal [11]. Dalam perkembangannya, pengelasan memiliki banyak jenis atau metode dengan komponen dan kegunaan yang berbeda-beda disetiap jenisnya.…”

“…Uji impact merupakan suatu pengujian yang mengukur ketangguhan material terhadap beban yang diberikan secara tiba-tiba. Uji impact merupakan sebuah metode yang sangat baik untuk mengukur ketangguhan takik suatu material secara sederhana [11]. Energi yang diserap oleh spesimen uji merupakan usaha yang dilakukan oleh pendulum ketika menghantam spesimen uji dapat dituliskan pada rumus sebagai berikut [12]:…”