Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

A management on mesh modelling for finite element analysis in casting simulation

100%

Cho C. , Kim W. , Choi B. , Kwak S. , Pan Q.

Journal of Achievements in Materials and Manufacturing Engineering

2007

tom Vol. 20, nr 1-2

335-338

Purpose: In this paper we present a finite element mesh management technique applied to analyze thermal stress distribution of mushy region including molten materials and solidifying shell. Design/methodology/approach: In this study we terminated and eliminated the finite elements representing molten materials on the element list. When they became cooler than the liquidus temperature, the deleted elements were recreated. Findings: We considered temperature-dependent material properties during simulation and adopted hybrid FDM/FEM method for enhancing accuracy: We validated the proposed technique by comparing with other methods. As results, the proposed method is found to effectively simulate real-time casting process. Research limitations/implications: The resulting simulation of conventional methods should induce errors on estimating residual stress of the cast subjected to non-uniform cooling. For the stress analysis study of casting process before complete solidification, we introduce a special technique to treat molten parts in the numerical procedure. This study proposes a method reducing by several orders the elastic modulus of molten material through employing a reduction factor. Practical implications: Conventional casting process simulations don't consider stress due to complex rheological behavior of molten metals until the cast completely solidifies. Achieving uniform cooling rate in a whole cast body while solidifying must be an ideal casting process to avoid undesirable thermal distortion and stress in product which may induce hot tear and crack. Conventionally many prototyping tests should be conducted to this end and necessitate expensive costs. Originality/value: In this study we propose a new technique of "Element Creation and Termination" which terminates (or removes) molten elements and creates them just after they cool down to lower than liquidus temperature. Notice that the previous methods do not remove but deactivate molten elements.

Effect of variants in the ovine skeletal-muscle-specific calpain gene on body weight

72%

Chun H. , Choi B. , Jang G. , Lee K. , Kim H. , Yoon S. , Im S. , Davies M. , Hines H.

Journal of Applied Genetics

2007

tom 48

nr 1

63-68

The ovine skeletal-muscle-specific calpain gene (p94), which is known also as the n-calpain or calpain 3 gene (CAPN3), was screened with primers. Selection of the PCR primers was based on the ovine cDNA sequence (GenBank accession No. AF087570). After sequence alignment between the ovine and human (AY902237) genes, exon and intron boundaries were determined. Polymorphisms were observed in the intron region for the CAPN31112 and CAPN31213 segments, and the sequences for these segments were submitted to the GenBank (AF309635 and AY102617, respectively). Body weight was recorded at birth, weaning and post-weaning. Calpain 3 genotypes of the CAPN31112 segment were associated with birth weight (P < 0.01), and a dominant gene effect was observed. Breeding group, birth type, and rearing type were significantly associated with weight traits. Allele frequencies were similar in purebred and crossbred animals.

Toxicological evaluation of flumequine in pubertal male rats after oral administration for six weeks

72%

Kang J. W. , Hossain M. A. , Choi B. , Cho J. H. , Kang S. J. , Ku H. O. , Jeong S. H. , Kang H. G.

Journal of Veterinary Research

2018

tom 62

nr 1