Study on the Fiber Orientation during Compression Molding of Reinforced Thermoplastic Composites

김진우,이동기 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.4

In this study, effect of fiber morphology on orientation is evaluated. Therefore, intersection angle for chopped strand, fiber length, and structure of fiber mat is changed to make the corresponding specimens and the relationship between compression ratio and fiber orientation is derived. Factors for controlling flow of glass fiber are glass fiber and matrix. 3 types of specimens, they are heated in oven as blank. Secondary hot press is applied. During compression molding, flow of test specimen is restricted to longitudinal direction. Measurement area for fiber orientation is 50 mm × 50 mm area in length of molded part, and the image is processed to confirm fiber orientation function. Fiber orientation function value, which is an indicator for directionality of fiber, is increased along with longer fiber length and higher compression ratio. Higher needle punching number induces tangling of fibers, and less fiber orientation function can be achieved. Fewer needles punching number results the less interference between fibers and fiber orientation function is increased accordingly. Fiber orientation angle, an indicator for fiber directionality in composite, can be empirically estimated according to compression ratio and fiber morphology using the derived equations.

유리섬유강화 고분자복합판의 압축성형에 있어서 섬유의 방향성에 관한 연구

서진 ( Jin Seo ) 조선대학교 공학기술연구원 2013 공학기술논문지 Vol.6 No.3

A composition is composed of a reinforcement and a matrix, which determine mechanical characteristics of the molded part. There is no doubt that the properties of a composites depend not only on the characteristics of the matrix but also on the structure of glass fiber mat and a fiber type of reinforcement. In this study, we made a sheet by means of a hot-press after accumulating a matrix and a glass fiber according to each fiber content by weight and length of glass fiber. The orientation function is obtained using one-dimensional rectangular shaped part compression molding. The fiber orientation function under various molding conditions is studied to grasp the fiber orientation during press molding. Result shows that the main factor having effect on fiber orientation function is the compression ratio. Also, we study effect of the mold temperature on the fiber orientation function.

The Fiber Orientation Distribution of Injection Molded Long Fiber Reinforced Polymeric Composites

Kim, Hyuk,Ann, Jongyoon,Yoon, Sungun CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.1

The characteristics of fiber-reinforced plastic composites depend on the quantity and shape of fibers. During a injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation orientation and injection molding conditions. So far, there is no study on the measurement of fiber orientation using image processing. In this study, the effects of fiber length, fiber content, matrix, and molding condition on the fiber distribution and by using image processing technique, a method is achieved for quantitative visualization of fiber orientation of a product which is injection molded of long fiber reinforced polymeric composites. Using the burning method, fiber content distribution in products and the effects of fiber content by weight on the fiber orientation functions are discussed.

섬유강화 복합재료의 사출성형에 있어서 섬유배향에 미치는 성형조건의 영향

이동기,한길영,김성용 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.2

Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line parts in injection-molded products is assessed. And the effects of fiber content and injection molding conditions on the fiber orientation functions are also discussed.

섬유강화 복합재료 사출성형품의 섬유배향상태

이정주,김진우,김혁,한길영,심재기,이동기 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

Injection molding is the most widely used process for the industrial forming of plastic articles. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation·orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of welding parts in injection-molded products is assessed. And the effects of fiber content and injection mold shapes on the fiber orientation in case of fiber reinforced polymeric composites are studied experimentally.

섬유강화 고분자 복합재료 사출성형품의 섬유배향상태

이동기,심재기,김진우 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.1

Injection molding is the most widely used process for the industrial forming of plastic articles. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation. orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of welding parts in injection-molded products is assessed. And the effects of fiber content and injection mold shapes on the fiber orientation in case of fiber reinforced polymeric composites are studied experimentally.

Efficient generator of random fiber distribution with diverse volume fractions by random fiber removal

Park, Shin-Mu,Lim, Jae Hyuk,Seong, Myeong Ryun,Sohn, Dongwoo Elsevier 2019 Composites Part B, Engineering Vol.167 No.-

<P><B>Abstract</B></P> <P>In this paper, we propose a simple and efficient generator of random fiber distribution with diverse fiber volume fractions ( <SUB> V f </SUB> ) for unidirectional composites by a random fiber removal technique. From the representative volume element (RVE) consisting of 100 fibers that have a maximum <SUB> V f </SUB> of about 65% in this work, also termed the master model, we randomly eliminate fibers to match the predefined <SUB> V f </SUB> ranging from 60%, 55%, 45%, 35%, 25%, 15%, and 5%, which are lower than that of the master model. Accordingly, 100 RVE samples for each <SUB> V f </SUB> can be constructed in a straightforward manner.</P> <P>To demonstrate the performance of the proposed algorithm, its fiber locations are verified in terms of statistical spatial metrics, such as the nearest neighbor orientation, Ripley's K function, and pair distribution function. Furthermore, the elastic properties and the anisotropic ratios of the generated RVEs are investigated and compared to those of other random fiber generation algorithms.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Efficient and powerful RVE generation with diverse volume fractions is achieved by random fiber removal technique. </LI> <LI> Once the finite element (FE) model of the master model is created, no further finite element (FE) model generation is required. </LI> <LI> By simply reassigning the material properties of the FE models for the fiber to those for the matrix, a new RVE can be generated. </LI> <LI> Through statistical spatial and physical metric evaluation, the performance of random removal technique proposed is verified. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

FRP의 사출성형에 있어서 섬유배향상태와 섬유함유율분포에 관한 연구

김진우(J. W. Kim),이동기(D. G. Lee) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5

Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line in injection-molded products is assessed. And the effects of fiber content and injection mold-gate conditions on the fiber orientation are also discussed.

FRP의 사출성형에 있어서 섬유배향상태와 섬유함유율분포에 관한 연구

김진우,이동기 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separationㆍorientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line in injection-molded products is assessed. And the effects of fiber content and injection mold-gate conditions on the fiber orientation are also discussed.

FRP의 사출성형에 있어서 섬유배향상태와 섬유함유율분포에 관한 연구

이동기(Dong-Gi Lee),심재기(Jea-Ki Sim),김진우(Jin-Woo Kim) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.4

Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation?orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line in injection-molded products is assessed. And the effects of fiber content and injection mold-gate conditions on the fiber orientation are also discussed.