Is there delamination wear in polyurethane?

Silva, Ruthilene C. Lima da; Silva, Carlos Henrique da; Medeiros, João Telésforo Nóbrega de

doi:10.1016/j.wear.2007.01.082

Cited by 23 publications

(14 citation statements)

References 13 publications

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“…Although wear mechanisms of the blends are among that of the pure polymers, no significant change has been observed with the compatibilizer content. The fatigue wave formation, which is common and associated with the fatigue mechanism due to the cyclic pass of asperity of the counterpart on the sample surface and can be assisted by the defects and a certain amount of stress concentration [28,29], was not observed in the worn surfaces of the samples. This is thought to be related to the abrasive nature of the sand paper.…”

Section: Resultsmentioning

confidence: 98%

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Effect of different parameters on the tribological performance of polypropylene/thermoplastic polyurethane blends under dry sliding conditions

Savaş

2019

Bull Mater Sci

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In this study, polypropylene/thermoplastic polyurethane (PP/TPU) blends (weight ratios of 75/25 and 25/75) were produced by melt blending, and a maleic anhydride-grafted polypropylene (PP-g-MA) copolymer was used as a coupling agent. The effect of the concentration of the coupling agent (5-11 phr), TPU concentration (25-75%), normal load (2-4 N) and sliding velocity (60-72 rpm) on the wear properties of the blends were characterized through a pin-on-disc abrasive wear test. A 2 4 full-factorial experimental design was chosen to screen the significant factors and their interactions influencing the tribological performance of the blends. After the tests, the morphology of the worn surface of the samples was observed using scanning electron microscopy. Shore D hardness tests were also conducted and the relationships between these behaviours were analysed on the basis of the findings. According to the wear test results, the factors that have the greatest effect on the wear rates are as follows: normal load, TPU concentration, sliding velocity and PP-g-MA concentration, respectively. The wear rate of the blends increases by increasing the normal load, TPU concentration and sliding speed, and slightly decreases by increasing the PP-g-MA concentration. As expected, the wear and hardness results showed the apparent superiority of the PP 75 /TPU 25 blends over the PP 25 /TPU 75 blends, because of the higher content of rigid segments in the blends.

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Section: Resultsmentioning

confidence: 98%

“…The TPUs have microphase separated domains composed of hard and soft segments (HSs and SSs, respectively). The HSs contain the diisocyanate components, and the SSs contain polyesters or polyethers [1,4,28]. The elastic modulus of the blends also tends to increase with the increase in rigid PP content in the blends [1].…”

Section: Resultsmentioning

confidence: 99%

Effect of different parameters on the tribological performance of polypropylene/thermoplastic polyurethane blends under dry sliding conditions

Savaş

2019

Bull Mater Sci

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“…Ayrıca plastik deformasyon ve adezif aşınma belirtilerine de (Şekil 11f) rastlanılmış olup, numuneler arasında ise belirgin bir farklılık görülmemektedir. Aşındırıcı üzerindeki bir çıkıntının numune yüzeyi üzerinden tekrarlı geçişinin sebep olduğu yorulma olayından kaynaklanan "yorulma dalgası" oluşumu (Myshkin et al 2005, Da Silva et al 2007 Abrazif aşınmada, nispeten daha yüksek sertliğe sahip bir malzeme yumuşak bir malzemeden parça kopartır ve oluşan aşınma ürünleri ya ara yüzeyde ya da sert malzeme yüzeyinde kalır (Kumar andPanneerselvam 2016, Suresha et al 2007). Oluşan aşınma ürünleri yuvarlanma etkisi veya yağlayıcı etki göstererek kompozitlerin aşınma direncini geliştiren bir etki de gösterebilir (Wang et al 2017).…”

Section: Deneysel Tasarım Metoduunclassified

Abrasive Wear Properties of Miswak and its Use as Reinforcement Phase in Dental Prosthesis Materials

Savaş¹

2018

AKU-J. Sci. Eng.

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Bu çalışmada misvak takviyeli kompozitlerin abrazif aşınma özellikleri incelenmiş ve yapısal parçalardan medikal uygulamalara kadar farklı sektörlerdeki kullanım potansiyeli araştırılmıştır. Matris malzemesi olarak polipropilen (PP) ve uyumlaştırıcı ajan olarak da maleik anhidrit aşılı polipropilen (PP-g-MA) kopolimeri kullanılmıştır. Farklı konsantrasyonlardaki (ağ. %5, 10, 20 ve 30) misvak takviyeli kompozitler, abrazif bir zımpara kâğıdının karşı disk olarak kullanıldığı bir pin-on-disk sisteminde test edilmiştir. Misvak konsantrasyonu, normal yük (2.5-5 N) ve kayma hızının (60-72 dev/dak) kompozitlerin aşınma özellikleri üzerindeki etkileri araştırılmıştır. Önemli parametrelerin ve bu parametrelerin etkileşimlerinin tribolojik özellikler üzerindeki etkilerini analiz etmek için 2 3 tam eşlendirmeli deneysel tasarım yöntemi kullanılmıştır. Testler sonrası numunelerin aşınmış yüzey morfolojileri taramalı elektron mikroskopisi (SEM) ile incelenmiştir. Shore D sertlik ölçüm testleri de yapılarak bulgular ışığında bahsedilen özellikler arasındaki ilişkiler yorumlanmıştır. Aşınma test sonuçlarından sırasıyla; normal yük, misvak konsantrasyonu ve kayma hızının önemli parametreler olduğu tespit edilmiştir. Kompozitlerin aşınma oranlarının artan yük, misvak konsantrasyonu ve kayma hızı ile arttığı bulunmuştur. Bununla birlikte, düşük misvak konsantrasyonuna (%5-10) sahip kompozitlerin nispeten düşük aşınma oranları gösterdiği tespit edilmiştir. Shore D sertlik testi sonuçlarından, artan misvak oranı ile kompozit sertliğinin de arttığı bulunmuştur. Bilindiği üzere tribolojik ve mekanik özellikler her zaman uyumlu değildir. Bu durumun zımpara kâğıdının abrazif yapısından ve literatürde ilk kez kullanılan vakum üniteli aşınma sisteminin 2-elemanlı abrazif aşınmayı desteklemesinden kaynaklandığı düşünülmektedir.

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“…Sui [5] provided one clarification for the physical deformation mechanisms of TPUs using in situ observation of the morphological changes during deformation and the finite element method. Da Silva discovered the delamination wear on TPUs [6]. Hausberger [7] studied the adhesive and deformation contribution to the friction and wear behaviors of TPUs.…”

Section: Introductionmentioning

confidence: 99%

Fretting Behavior of Thermoplastic Polyurethanes

et al. 2019

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Fretting tests were conducted with five different thermoplastic polyurethanes against a steel ball. Their fretting behaviors were investigated under various test parameters, such as normal load and displacement amplitude. In order to test the sliding performances, tribological tests were conducted using a ring-on-disc setup. The results show that their fretting behaviors can be related to the dynamic mechanical properties, which were characterized by dynamic mechanical analysis (DMA). The three fretting regimes were identified by means of hysteresis and wear scar analysis. In addition, investigations were carried out until the transition regimes occurred. Different wear processes were revealed for each of the three regimes. Differences were identified using dissipated energy. The profiles of wear scars and the counterparts were analyzed using a microscope. The coefficient of friction was calculated separately for the partial slip and gross slip regimes. In the mixed fretting regime, the coefficient of friction is almost at the same level among the five materials. In the partial slip regime, however, it can be distinguished. Temperature measurements were conducted on the counterparts during the tests. Overall, the material that showed the best tribological properties also performed the best in the fretting tests.

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Is there delamination wear in polyurethane?

Cited by 23 publications

References 13 publications

Effect of different parameters on the tribological performance of polypropylene/thermoplastic polyurethane blends under dry sliding conditions

Effect of different parameters on the tribological performance of polypropylene/thermoplastic polyurethane blends under dry sliding conditions

Abrasive Wear Properties of Miswak and its Use as Reinforcement Phase in Dental Prosthesis Materials

Fretting Behavior of Thermoplastic Polyurethanes

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