A method to represent impacted structures using scaled models made of different materials

Mazzariol, L.M.; Oshiro, R.E.; Alves, Marcı́lio

doi:10.1016/j.ijimpeng.2015.11.018

Cited by 59 publications

(38 citation statements)

References 19 publications

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“…Further development was conducted to refine the accuracy of the formula, such as the work of Zhang [9]. A notable trend related to impact phenomena, considering effectiveness in terms of time and cost, is experimental testing, preferably conducted by scaled model tests [10,11]. In early 2000, improvements of computational technology and calculation algorithms resulted in this tendency accelerating, and numerical has become a new evaluation strategy to obtain predicted data for almost all science and engineering phenomena.…”

Section: X2mentioning

confidence: 99%

Estimating Structure Response and Progressive Failure of a Ship Hull under Side-Bow Collisions

et al. 2018

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This paper presents an analysis of the side hull in marine steel structures under accidental collision phenomena. The type of side collision considered in this work is where the striking ship penetrates the struck ship. First, the configuration of the collision phenomenon is defined, including the ship geometry, mechanical properties of the material, and applied parameters. The collision scenarios are built by applying external dynamic parameters, including target location and striking velocity. Impact locations are determined on three different regions of the struck ship's side hull: the fore-end, middle-hull, and after-end regions. These are discussed, followed by results based on the applied velocity. Second, the tendency of the collision energy is evaluated to observe the structural behaviour on the struck ship's side hull during penetration by the striking ship. Progressive failure is summarised based on the results of two parameters, and f the material model is confirmed by comparing the collision energy with pioneering work on ship collision.

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Section: X2mentioning

confidence: 99%

Estimating Structure Response and Progressive Failure of a Ship Hull under Side-Bow Collisions

et al. 2018

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“…Based on this system, one more basic scaling factor ( was velocity) was used to scale the behaviors of prototype by reasonably correcting the impact velocity and impact mass of scaled model (Oshiro and Alves, 2004;2007;2009; Alves and Oshiro, 2006a;. The material distortion for the difference of density, yield stress and strain-rate-sensitivity between scaled model and prototype can also be compensated by increasing one more number and one more basic factor into the VSG system, where and were structure mass and density, respectively (Mazzariol, et al, 2016). The solutions of material distortion, further including material strain hardening effects, were verified by a group of transport equations of the continuum mechanics in the work of Sadeghi, et al (2019a;.…”

Section: Introductionmentioning

confidence: 99%

Suggestion of a Framework of Similarity Laws for Geometric Distorted Structures Subjected to Impact Loading

Wang¹,

Xu²,

Zhang³

et al. 2020

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A framework of similarity laws, termed oriented-density-length-velocity (ODLV) framework, is suggested for the geometric distorted structures subjected to impact loading. The distinct feature of this framework is that the newly proposed oriented dimensions, dimensionless numbers and scaling factors for physical quantity are explicitly expressed by the characteristic lengths of three spatial directions, which overcome the inherent defects that traditional scalar dimensional analysis could not express the effects of structural geometric characteristics and spatial directions for similarity. The non-scalabilities of geometrical distortion as well as other distortions such as different materials and gravity could be compensated by the reasonable correction for the impact velocity, the geometrical thickness and the density, when the proposed dimensionless number of equivalent stress is used between scaled model and prototype. Three analytical models of beam, plate and shell subjected to impact mass or impulsive velocity are verified by equation analysis. And a numerical model of circular plate subjected to dynamic pressure pulse is verified in more detail, form the view of point of space deformation, deformation history and the components of displacement, strain and stress. The results show that the proposed dimensionless numbers have attractively perfect ability to express the dimensionless response equations of displacement, angle, time, strain and strain rate. When the proposed dimensionless numbers are used to regularize impact models, the structural responses of the geometrically distorted scaled models can behave the completely identical behaviors with those of the prototype on space and time —not only for the direction-independent equivalent stress, strain and strain rate but also for the direction-dependent displacement, stress and strain components.

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“…Mazzariol, et al. [19,20] further used the basic correction factor of density to compensate distortion of the different materials in density, and set the average strain-rate to 1 −1 to simplify the previous indirect difficulties. Some different materials behaved good similarity, while others had significant errors [19].…”

Section: Introductionmentioning

confidence: 99%

“…[19,20] further used the basic correction factor of density to compensate distortion of the different materials in density, and set the average strain-rate to 1 −1 to simplify the previous indirect difficulties. Some different materials behaved good similarity, while others had significant errors [19]. A more comprehensive consideration for distortion of the different materials further including strain-hardening effects, temperature effects and failure are developed by Sadeghi et al [21,22], and a fixed strain and strain-rate window instead of the average strain and strain-rate was used to simplify the previous indirect difficulty.…”

Section: Introductionmentioning

confidence: 99%

Material Similarity of Scaled Models

Wang¹,

Xu²,

Zhang³

et al. 2020

Preprint

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When different strain hardening and strain rate sensitive materials are used for scaled model and prototype, the traditional pure geometrical similarity laws of solid mechanics will fail. Although correcting the basic scaling factors of velocity, density and geometry have been developed to compensate for the material distortion in recent non-geometric scaling works, it is difficult to be widely used because of its inherent indirect (depending on the structural strain and strain rate responses) and inexact (having significant prediction errors for prototype) defects. In this paper, a framework of material similarity, based on the new suggested material dimensionless numbers and the ‘Material number vs. strain/strain-rate’ function curves, are further developed, which represents the objective requirement of similarity theory for the basic mechanical properties of materials. It is demonstrated what is similitude materials of solid mechanics and how to use the best similitude materials to overcome the non-scalabilities of materials for identical or different materials. The direct and exact solution of the basic correction factors is further obtained and therefore overcomes the previous inherent indirect and inexact defects radically. Based on the similarity evaluation of different materials of the classical constitutive models, the impacted structures of circular plate and crooked plate with strain hardening and strain rate sensitive materials are verified numerically. The results show the completely different materials can be exact similitude for various structural behaviors (strain, strain rate, stress and displacement) of time and space fields after using the best similitude materials; and the basic correction factors do not depend on the structural strain and strain rate responses. As a contrast, when the non-similitude materials are used, the similarity results are very sensitive to the selection of strain/strain-rate and often leads to failed predictions. In addition, for the material elastic and temperature effects, the proposed method is also discussed to be valid.

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A method to represent impacted structures using scaled models made of different materials

Cited by 59 publications

References 19 publications

Estimating Structure Response and Progressive Failure of a Ship Hull under Side-Bow Collisions

Estimating Structure Response and Progressive Failure of a Ship Hull under Side-Bow Collisions

Suggestion of a Framework of Similarity Laws for Geometric Distorted Structures Subjected to Impact Loading

Material Similarity of Scaled Models

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