Scaling impacted structures

Oshiro, R.E.; Alves, Marcı́lio

doi:10.1007/bf02637214

Cited by 7 publications

(20 citation statements)

References 13 publications

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“…This limitation is shown in this paper to be overcome by a methodology that can be applied to correct impact velocity, as in Ref. [16], or impact mass, as demonstrated here.…”

Section: Discussionmentioning

confidence: 94%

“…[16] by showing that it is also possible to correct the impact mass instead of impact velocity. This sometimes might be an important requirement due to experimental constraints.…”

Section: Article In Pressmentioning

confidence: 98%

“…In Ref. [16], we sought to find a b V 0 different from the unity since we were correcting the initial impact velocity. Here, we make b V 0 ¼ 1 so it obeys the linear scaling laws.…”

Section: Article In Pressmentioning

confidence: 99%

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Scaling the impact of a mass on a structure

Alves

Oshiro

2006

International Journal of Impact Engineering

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“…This limitation is shown in this paper to be overcome by a methodology that can be applied to correct impact velocity, as in Ref. [16], or impact mass, as demonstrated here.…”

Section: Discussionmentioning

confidence: 94%

“…[16] by showing that it is also possible to correct the impact mass instead of impact velocity. This sometimes might be an important requirement due to experimental constraints.…”

Section: Article In Pressmentioning

confidence: 98%

See 1 more Smart Citation

Scaling the impact of a mass on a structure

Alves

Oshiro

2006

International Journal of Impact Engineering

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“…(7), it is considered that w f is in the direct proportion to Zhao's Rn number. Equation (11) can be written as follows:…”

Section: Similarity Analysismentioning

confidence: 99%

“…In 2004, the problem of non-scalability of structures under impact loads caused by strain rate effects was solved by Oshiro and Alves [10][11] . The results showed the very good agreement so that the model and the prototype made of strain rate sensitive materials behaved the same.…”

Section: Introductionmentioning

confidence: 99%

Similarity research of anomalous dynamic response of ship girder subjected to near field underwater explosion

Zhen-hua

Wang

Zhang

et al. 2011

Appl. Math. Mech.-Engl. Ed.

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The final anomalous sag distortion of the ship girder subjected to the near field underwater explosion (undex) below the middle ship is studied. The sinking exercise of Spruance class destroyer DD973 sunk by one MK48 torpedo is first presented, and a simulation model is established. The exponential attenuation phase, the reciprocal attenuation phase, the post reciprocal attenuation phase, and the negative pressure phase of the undex load are precisely applied in this model. The fluid-solid interaction, the added water mass, the gravity, and the change of buoyancy are also taken into account. The similarity theory is then used to analyze the dynamic response of the ship girder. Similarity parameters and theory prediction formulae of the dynamic response of the ship girder are presented. The physical meaning and influences of these similarity parameters are analyzed.

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Suggestion of the DLV dimensionless number system to represent the scaled behavior of structures under impact loads

Wang

Dai

2019

Arch Appl Mech

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Highlights(1) The DLV dimensionless number system to represent structural impact is proposed.(2) Two well-known numbers, the damage number and the response number, are naturally included in DLV dimensionless numbers.(3) The property of directly matching the dimensionless expression of the response equations is verified through simple equation analysis of four impact models.(4) The ability of addressing non-scalability as well as the VSG system is confirmed. 3 ABSTRACT ： A group of dimensionless numbers, termed DLV (Density-Length-Velocity) system, is put forward to represent the scaled behavior of structures under impact loads. It is obtained by means of the Buckingham Π theorem with an alternative basis. The distinct features of this group of dimensionless numbers are that it relates physical quantities of the impacted structure with essential basis of the Density, the Length and the Velocity, and thus it can represent the scaled influence of material property, geometry characteristic and velocity on the behavior of structures. The newly 15 proposed dimensionless numbers reflect three advantages. (1) The intuitively clear physical significance of these dimensionless numbers, such as the ratios of force intensity, force, moment of inertia to the corresponding dynamic quantities, the Johnson's damage number and Zhao's response number etc. are naturally included. (2) The property of directly matching the dimensionless expression of response equations of dynamic problems with these dimensionless numbers through simple equation analysis; (3) The ability of addressing non-scaling problems for different materials and strain-rate-sensitive as well as the VSG (initial impact Velocity-dynamic flow Stress-impact mass G) system. Four classical impact models are used to verify the directly matching property and the non-scaling addressing ability of the DLV system by equation analysis. The results show that the proposed dimensionless number system is simple, clear and efficient, and we suggest using it to represent the scaled behavior of structures under impact loads.

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Scaling impacted structures

Cited by 7 publications

References 13 publications

Scaling the impact of a mass on a structure

Scaling the impact of a mass on a structure

Similarity research of anomalous dynamic response of ship girder subjected to near field underwater explosion

Suggestion of the DLV dimensionless number system to represent the scaled behavior of structures under impact loads

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