Dynamic Fracture Toughness Analysis of H-13 Hot Worked Die Steel by Instrumented Impact Testing PDF Download
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Author: D. Simon Shong
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 264
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Book Description
Author: D. Simon Shong
Publisher:
ISBN:
Category : Steel
Languages : en
Pages : 264
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Book Description
Author: California. Office of Transportation Laboratory
Publisher:
ISBN:
Category : Steel
Languages : en
Pages :
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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: Welding Institute
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 364
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Book Description
Author: Thomas Michael Breunig
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 236
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Book Description
Author: CH. Curll
Publisher:
ISBN:
Category : Alloy steels
Languages : en
Pages : 11
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Book Description
Instrumented impact test systems have been designed for determination of dynamic fracture toughness properties and utilized for the study of impact properties of materials in many laboratories. Since equipment varies from laboratory to laboratory, variations due to the equipment or instrumentation or both should be examined. This investigation studies variations in dynamic fracture toughness due to the test machine or calibration methods or both. The parameters chosen for the study are the peak load and the fracture energy. Two materials, AISI-4340 steel alloy and 6061-T6 aluminum alloy, were selected to evaluate the variation of these parameters.
Author: CE. Turner
Publisher:
ISBN:
Category : Brittle fracture
Languages : en
Pages : 22
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Book Description
Previous studies of the Charpy impact test using instrumented pendulum or anvil with V-noteh steel specimens are reviewed. It is concluded that such results add little to the usefulness of the test since even cleavage fractures are normally well beyond yield. No fracture toughness index emerges other than the simple measure of energy from the pendulum. In a second generation of work, fatigue cracked and side grooved (fcsg) specimens promoted below yield fractures up to about the 50 percent fracture appearance transition temperature (fatt). These results have been analysed by linear fracture mechanics to give the dynamic fracture toughness KID. In this interpretation understanding of the oscillations in load records due to specimen vibration is important. Results are discussed in the light of recent studies including an analog model with which near quantitative agreement is found. An improved simple correction factor for inertia loading effects is presented. It is concluded from both this work and supporting measurements of KID by other techniques that dynamic fracture toughness KID can be measured for low-strength steels using the instrumented fcsg impact test subject to the precautions and corrections discussed. Typical values of KID for mild steel are 60 ksi ?in. at 0 C falling to 30 ksi ?in. at -60 C. The significance of these low values in relation to the much higher static toughness is discussed briefly.
Author: C. Y. Chiem
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 576
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Book Description
Author: TJ. Koppenaal
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 26
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Book Description
The dynamic fracture toughness, KId, was measured in a number of ferrous alloys using precracked Charpy specimens and an instrumented impact machine. The alloys investigated included quenched and tempered steels (H-11, D6AC, and 4340), 18Ni maraging steels (grades 200, 250, and 300) and a high-temperature, stainless maraging steel (Pyromet X-15). Standard Charpy specimens were precracked in fatigue and tested at either 72°F (22°C) or -65°F (-54°C). Values of KId, were determined as a function of yield strength and microstructure, and correlations were established between KId and both the energy to initiate fracture, Wm/A, and the total energy of fracture, W/A. The instrumented, precracked Charpy test is shown to be a convenient method of determining relative fracture toughness; under proper conditions this test procedure can be used to determine the dynamic planestrain fracture toughness.
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.
