Tensile Behavior of T91 Steel Over a Wide Range of Temperatures and Strain-Rate Up To 104 s−1

Scapin, Martina; Peroni, Lorenzo; Fichera, Claudio; Cambriani, Andrea

doi:10.1007/s11665-014-1081-x

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…The strain measurement of incident, reflected, and transmitted waves was performed by means of high sensitivity semiconductor strain gauges (KYOWA KSP‐1‐350‐E) attached to both input and output bar, and processed to derive the corresponding stress values. Further details of the setup have been communicated by Scapin et al Besides, specifically for the tensile tests the HPB setup has been equipped with a high‐speed video camera (PHOTRON SA5). Footage of the tests is recorded at 50 000 frames per second with a resolution of 640 × 208 pixels.…”

Section: Methodsmentioning

confidence: 99%

High Strain Rate Tensile and Compressive Testing and Performance of Mesoporous Invar (FeNi36) Matrix Syntactic Foams Produced by Feedstock Extrusion

et al. 2016

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The present study investigates the high strain rate behavior of mesoporous metal matrix syntactic foams focusing on the dependence of compressive and tensile properties on strain rate. The strain rate range, covered both in compression and tension, extends from quasi-static conditions or 10 À3 s À1 to 10 3 s À1 . Syntactic foams based on commercial high strength hollow glass microspheres and Invar (FeNi36) matrix are produced by means of feedstock extrusion and subsequent sintering. Levels of glass microsphere addition examined are 5 and 10 wt%, respectively, corresponding to approximately 40 and 60 vol% of microspheres in the initial mix prior to sintering, and considering the metal and filler fraction only. Reference samples containing no microsphere addition have been included in the study. Mechanical testing is accompanied by metallographic examinations.

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Section: Methodsmentioning

confidence: 99%

High Strain Rate Tensile and Compressive Testing and Performance of Mesoporous Invar (FeNi36) Matrix Syntactic Foams Produced by Feedstock Extrusion

et al. 2016

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“…To test the proposed approach a benchmark case was developed by creating an ad-hoc experimental profile obtained via a numerical simulation of a sample ( fig. 2) with a known J-C material model (the reference hardening parameters are: A=446 MPa, B=511 MPa and n=0.221 [5]). The experimental test was simulated and the shape of the specimen and the load-stroke curve of the sample obtained from the numerical model.…”

Section: The Necking Profilementioning

confidence: 99%

“…Each case was simulated and the specimen profile associated with the corresponding loadstroke curve was obtained from the numerical model. In all the model the same final displacement was imposed, even if it could not be the same in a real experimental campaign [5]: the value was chosen in order to overcome the 100% of effective plastic strain in the dynamic case at room temperature.…”

Section: Dynamic Loading Conditionsmentioning

confidence: 99%

“…Another possibility is represented by numerical inverse methods based on FE simulations, in which, independently from the strain measurement, the flow stress identification was performed on the iterative matching between macroscopic quantities (e.g. force vs. displacement curve) [5][6]. In any case, it is important to consider that to perform the model calibration based on stress (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Strength Model Evaluation Based on Experimental Measurements of Necking Profile in Ductile Metals

Peroni

Scapin

2018

EPJ Web Conf.

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The reliability of the numerical results strongly depends upon the choice of the constitutive models, which sometimes requires an ad-hoc calibration of the parameters starting from experimental results. Often, the tension test is chosen since it allows obtaining a big amount of data, but in case of ductile materials, in which the specimen could be subjected to high value of plastic strain before the fracture, it is necessary to properly manage the experimental results. For low values of deformation, the deformation of the gage length of the specimen is uniform and the true stress can be easily derived from the longitudinal one and considered as the equivalent stress. At the onset of necking, geometrical instability and concentration of deformation are developed. In the scientific literature several different approaches have been proposed in order to estimate the equivalent stress distribution in the post-necking regime. In this work, a new approach was proposed by the combination of digital image analysis and numerical inverse method. The evolution of the profile deformation of the specimen observed during the test is directly used to identify the constitutive relation of the material in case of dynamic tensile tests.

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“…One possibility is to increase the speed of the striker bar, but this also increases the stress level in the bar, which is limited by the yield strength of its material. Another possibility is the reduction of the specimen dimensions [198]. For this reason, two different specimen geometries were used depending on test conditions.…”

Section: Extraction Of J-c Parameters Of Iridium By Dynamic Testingmentioning

confidence: 99%

Comprehensive Study and Optimized Redesign of the CERN's Antiproton Decelerator Target

Torregrosa-Martin¹,

Leopoldo²

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The Antiproton Decelerator Target (AD-Target) is a unique device responsible for the production of antiprotons at the European Organization for Nuclear Research (CERN). During operation, intense 26 GeV energy proton beams are impacted into its core, made of a 3 mm diameter rod of a high density material such as iridium, creating secondary particles-including antiprotons-from the nuclear reactions induced in its interior. This thesis delves into the characteristics of antiproton production and in particular in the mechanical response of the target core material, which is exposed to a rise of temperature of ∼ 2000 • C in less than 0.5 µs each time is impacted by the primary proton beam. A coupled numericalexperimental approach has been applied for this purpose. Finalmente, agradecer infinitamente a mi familia, primos y tíos. Y más que a nadie a mis padres y hermana, por su cariño y apoyo incondicional, ahora y siempre. Este doctorado es tan suyo como mío.

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Tensile Behavior of T91 Steel Over a Wide Range of Temperatures and Strain-Rate Up To 104 s−1

Cited by 8 publications

References 25 publications

High Strain Rate Tensile and Compressive Testing and Performance of Mesoporous Invar (FeNi36) Matrix Syntactic Foams Produced by Feedstock Extrusion

High Strain Rate Tensile and Compressive Testing and Performance of Mesoporous Invar (FeNi36) Matrix Syntactic Foams Produced by Feedstock Extrusion

Strength Model Evaluation Based on Experimental Measurements of Necking Profile in Ductile Metals

Comprehensive Study and Optimized Redesign of the CERN's Antiproton Decelerator Target

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