Evaluation of Current Procedures for Dynamic Fracture-Toughness Testing PDF Download
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Author: WL. Server
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 16
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Book Description
Instrumented impact test requirements for impact velocity, inertial loading, time to fracture, and frequency response were developed as a part of a large testing program sponsored by the Electric Power Research Institute (EPRI). These test procedures relied heavily on current ASTM standards plus the composite experience of investigators throughout the world. This paper provides experimental verification of the EPRI developed procedures and clarifies some of the empirical relationships used in the procedures. The material investigated was a 4340 steel (Rc52) which was relatively insensitive to loading rate. Load-time information obtained simultaneously from an instrumented tup and strain-gaged specimen was analyzed for tests performed at various impact velocities. The results indicate that the EPRI developed procedures are conservative and allow reliable fracture-toughness measurements to be made.
Author: WL. Server
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 16
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Book Description
Instrumented impact test requirements for impact velocity, inertial loading, time to fracture, and frequency response were developed as a part of a large testing program sponsored by the Electric Power Research Institute (EPRI). These test procedures relied heavily on current ASTM standards plus the composite experience of investigators throughout the world. This paper provides experimental verification of the EPRI developed procedures and clarifies some of the empirical relationships used in the procedures. The material investigated was a 4340 steel (Rc52) which was relatively insensitive to loading rate. Load-time information obtained simultaneously from an instrumented tup and strain-gaged specimen was analyzed for tests performed at various impact velocities. The results indicate that the EPRI developed procedures are conservative and allow reliable fracture-toughness measurements to be made.
Author: Welding Institute
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 364
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Book Description
Author: T. Ochiai
Publisher:
ISBN:
Category : Brittle fracture
Languages : en
Pages : 34
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Book Description
Fracture toughness properties of structural steels of 490-MPa strength class and weld metals under dynamic loading are studied in the light of the near crack tip stress fields. The loading rate in toughness tests range from 0.1 to 500 mm/s. The near-tip stress fields are analyzed by 3D-FEM considering the strain rate effect on the flow properties of materials. Temperature rise caused by high-speed plastic deformation is also included in the FE analysis. The critical CTOD at brittle fracture initiation decreases when increasing the loading rate. This is due to the elevation of a local stress near the crack tip. The local approach is applied to the dynamic fracture toughness evaluation. It is shown that the brittle fracture resistance evaluated in terms of the Weibull stress, an integrated stress over a highly stressed region near the crack tip, is a material property independent of the loading rate. Based on the Weibull stress fracture criterion, the dynamic fracture toughness can be predicted from static toughness results. An engineering procedure to estimate the loading rate effect on the fracture toughness is also presented.
Author: T. Kobayashi
Publisher:
ISBN:
Category : Absorbed energy
Languages : en
Pages : 9
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Book Description
Instrumented Charpy impact test has been widely used as a simple method for semi-empirically evaluating material impact toughness. The authors have developed a new instrumented Charpy impact testing system, which is called CAI (Computer Aided instrumented Charpy Impact testing) system. Using the CAI system, dynamic fracture toughness parameters such as Kd, Jd, Tmat, and various absorbed energies can be obtained from the load-deflection curve of a single precracked specimen for both ductile and brittle materials. It has been already put into practical use in Japan. This paper introduces the details of the toughness evaluation procedures in the CAI system.
Author:
Publisher: ASTM International
ISBN:
Category :
Languages : en
Pages : 533
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Book Description
Author: GB. Lenkey
Publisher:
ISBN:
Category : Dynamic fracture toughness
Languages : en
Pages : 16
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Book Description
In the engineering practice it is of importance to know the effect of loading rate on the material behaviour, e.g., on the fracture mechanics properties. One of the most widely used testing techniques for determining these properties is the instrumented impact test. Depending on the material behaviour under a given loading condition, different fracture mechanics parameters should be determined. Most of the evaluation procedures of these parameters are still not standardised for higher loading rates. So the aim of the present work was to investigate the applicability of different methods for determining dynamic fracture toughness properties. Instrumented impact experiments combining with magnetic emission measurement have been performed on pre-cracked Charpy-V specimens of E420 C and QStE 690 TM high strength steels. Critical values of stress intensity factor (KId, KJi) related to the initiation of the fracture at different temperatures have been determined Using different methods depending on the type of the fracture.
Author: John M. Barsom
Publisher: ASTM International
ISBN: 9780803103566
Category : Technology & Engineering
Languages : en
Pages : 538
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Book Description
Author: PC. Paris
Publisher:
ISBN:
Category : Crack propagation
Languages : en
Pages : 13
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Book Description
Within this paper it is demonstrated that dynamic fracture toughness evaluation may be made by adherence to the ASTM Test for Plane-Strain Fracture Toughness of Metallic Materials (E 399-72) procedure with the single exception of test speed. The test procedure, specimen, fixturing, and instrumentation are otherwise identical to ASTM E 399-72. This makes possible direct comparisons of static, KIc values with the results of these dynamic tests.
Author:
Publisher: ASTM International
ISBN:
Category : Mathematics
Languages : en
Pages : 124
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Book Description
Author: Ravinder Chona
Publisher: ASTM International
ISBN: 080311429X
Category : Metals
Languages : en
Pages : 187
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Book Description
