The Influence of Interface Geometry on the Joint Strengths of Hot Plate Welded Composites

Liu, Shih‐Jung; Cheng, Hsin-Fu

doi:10.1177/0731684408099410

Cited by 20 publications

(7 citation statements)

References 11 publications

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“…Similar results have been reported by J. S. Liu, H. F. Cheng 13 Under the influence of the welding pressure, the plasticized material in the weld zone flows. With increasing penetration, fibers push out of the surface.…”

Section: Tensile Test Resultssupporting

confidence: 79%

“…It is clear that a weld does not represent just a discontinuity in the material, but is the source of an extended mechanical disturbance, which strongly influences the local material's behavior, even at a distance outside the weld. 13 It can be noticed that for the higher MA-g-PP/GF content the local strain (Table 4) in the accompanying zones is lower, which corresponds to the lower compliance of the reinforced material. Also, in this case the lower pressure results in a local strain super elevation at the weld.…”

Section: Tensile Test Resultsmentioning

confidence: 99%

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The effect of the welding parameters and the coupling agent on the welding of composites

Erdogan¹,

Hüner

2016

Mater. Tehnol.

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This paper presents an experimental investigation of the welding of a glass-fiber-reinforced PP composite. The goals of this paper are to investigate the issues of local changes of the welding strength that depend on the heating time and the coupling agent (MAPP). Composite samples were prepared by using an extruding (for mixing) process and a hot-press method. The PP matrix was reinforced by unidirectional short glass fibers. The welding process for the specimens was carried out using a non-contact heated tool butt welding process. Tensile and fatigue tests were conducted to investigate the effects of the heating time parameter and the coupling agent. The highest weld strength dependent on the heating time was achieved with 94 % relative to the base strength of the material. The fatigue behavior of short-fiber-reinforced thermoplastic composites (polypropylene/20 % of volume fractions of E-glass fiber) is presented in terms of stress versus the number of cycles to failure. The specimens were fatigue tested at various percentages of their static tensile strengths at a load ratio R = 0.1 and frequency f= 5 Hz. An indefinite fatigue life was obtained at 35 % of the static damage initiation load for glass-fiber-reinforced specimens. Then, these specimen's maximum welding strengths and fatigue properties that were dependent on the heating time were compared. Keywords: plastic material, composite, heated tool, welding process, reinforcement, fatigue, polypropylenê lanek predstavlja preiskavo varjenja PP kompozita, oja~anega s steklenimi vlakni. Cilj~lanka je bil preiskati vpliv lokalnih sprememb na trdnost zvara, ki je odvisna od~asa ogrevanja in sredstva za spajanje (MAPP). Kompozitni vzorci so bili pripravljeni z uporabo metode ekstruzije in vro~ega stiskanja. PP osnova je bila oja~ana z usmerjenimi kratkimi steklenimi vlakni. Postopek~elnega varjenja vzorcev je bil izveden z brezkontaktno ogrevanim orodjem. Izvedeni so bili natezni preizkusi in preizkusi utrujenosti, da bi ugotovili vpliv~asa ogrevanja in sredstva za spajanje. Najve~ja trdnost zvara v odvisnosti od~asa ogrevanja je bila 94 % trdnosti osnovnega materiala. Obna{anje pri utrujanju termoplasti~nega kompozita (polipropilen/20 % prostorninskih dele`ev E-steklenih vlaken), oja~anega s kratkimi vlakni, je prikazano na krivulji utrujanja kot odvisnost napetosti od {tevila ciklov. Utrujenost vzorcev je bila preizku{ana pri razli~nih odstotkih stati~ne natezne trdnosti, pri hitrosti obremenjevanja R = 0,1 in frekvenci f = 5 Hz. Zdr`ljivost na utrujanje s steklenimi vlakni oja~anih vzorcev je bila dobljena pri 35 % nazivne stati~ne obremenitve. Primerjane so bile maksimalne trdnosti zvarov, z obna{anjem pri utrujanju v odvisnosti od asa ogrevanja.

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Section: Tensile Test Resultssupporting

confidence: 79%

Section: Tensile Test Resultsmentioning

confidence: 99%

The effect of the welding parameters and the coupling agent on the welding of composites

Erdogan¹,

Hüner

2016

Mater. Tehnol.

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“…Various investigations have been conducted on possibilities to prevent fiber orientation being perpendicular to the load direction in welds and thereby to attain higher welding factors in welding of fiber reinforced thermoplastics [4,6,[10][11][12]. One investigated influencing factor is the fiber orientation in the nonwelded part which is referred to as initial fiber orientation hereafter.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Initial Fiber Orientation on the Weld Strength in Welding of Glass Fiber Reinforced Thermoplastics

Fiebig

Schöeppner

2016

International Journal of Polymer Science

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The welding factors are significantly lower in welding of fiber reinforced thermoplastics than in welding of unreinforced thermoplastics due to the fiber orientation in the weld. This paper presents results from investigations on the influence of the initial fiber orientation on the weld strength in hot plate and vibration welding for glass fiber reinforced polypropylene and polyamide 6. Injection molded specimens are compared to specimens with main initial fiber orientation being longitudinal and transverse to the joining direction. The results of CT analysis of the fiber orientation in the weld show the opportunity to achieve a higher weld strength by using specimens with fibers being initially oriented longitudinally to the joining direction. The influence of the initial fiber orientation in the parts to be welded on the weld strength in hot plate welding is more distinct than in vibration welding.

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“…21 Heating time, geometry of weld interface, and hot plate temperature were found to be the most important factors affecting the weld quality of hot plate welded part. 11 Heating time and pressure are the most important parameter for polypropylene. 22 Weld strength is affected by extent of melt displacement during the welding operation, period in contact with the hot plate, and hot plate temperature.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Triangular and square interfaces provide highest weld joint strength. 11 Differential scanning calorimetric (DSC) analysis and thermogravimetric analysis (TGA) can be used to propose a welding temperature regime. 12 Different methodologies are nowadays available for optimizing the process.…”

Section: Introductionmentioning

confidence: 99%

Modeling the interrelationship between the parameters for improving weld strength in plastic hot plate welding: A DEMATEL approach

Mathiyazhagan

Singh

Sivabharathi³

2019

Journal of Elastomers & Plastics

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Application of plastics is increasing day by day since plastics offer many distinct advantages as compared to metals. Plastics has mainly good thermal and electrical insulation properties, corrosion resistance, chemical inertness, and high strength to weight ratio. Additionally, these are cheaper in cost as compared to conventional materials. Plastics are additionally easy to process. Nowadays, product requirements are getting critical and thus product design is getting more complex in shape. To manufacture intricate complex shape creates complexity in manufacturing process which is sometimes very difficult or almost not feasible to produce with single manufacturing process. To manufacture such critical products, welding is a complimentary process. Type of weld joint and welding process can be selected based on the product design and load application on the product. Hot plate welding is very simple welding process as compared to other plastic welding process and most commonly used. Good quality weld is the prime objective of welding process. Weld strength is dependent on several parameters which may be process parameters as well as product parameters. The objective of this study is to identify the key parameters in hot plate welding process of the plastics using Decision Making Trial and Evaluation Laboratory which is one of the prioritization techniques. Results of the study focus on understanding the key parameters affecting the weld strength. Study shows that hot plate temperature, welding time, and melting time are the key parameters affecting the weld strength.

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The Influence of Interface Geometry on the Joint Strengths of Hot Plate Welded Composites

Cited by 20 publications

References 11 publications

The effect of the welding parameters and the coupling agent on the welding of composites

The effect of the welding parameters and the coupling agent on the welding of composites

Influence of the Initial Fiber Orientation on the Weld Strength in Welding of Glass Fiber Reinforced Thermoplastics

Modeling the interrelationship between the parameters for improving weld strength in plastic hot plate welding: A DEMATEL approach

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