The ball on three balls test—Strength and failure analysis of different materials

Dänzer, Robert; Harrer, Walter; Supancic, Peter; Lube, Tanja; Wang, Zhonghua; Börger, Andreas

doi:10.1016/j.jeurceramsoc.2006.05.034

Cited by 119 publications

(66 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ayrıca, mesnetlerdeki çelik bilyeler ile numune yüzeyi arasındaki temas diğer yöntemlere göre daha az olduğundan sürtünme çok daha az olmaktadır. Deney sonunda, göçme yükü ölçülür, yükleme noktasından üçgenin kenarlarının orta noktalarına uzanan çatlak çizgilerine radyal doğrultularda asal gerilmeler oluşur ve bu gerilme iki eksenli çekme dayanımı olarak tanımlanır [15]. Denklemde P maksimum yük (göçme Yükü), t üçgen plaka et kalınlığı, σ malzemenin iki eksenli çekme dayanımıdır.…”

Section: üçGen Plaka Yöntemi̇ (Triangular Plate Method)unclassified

Çi̇mento Esasli Malzemeleri̇n Çekme Dayanimlarini Bulabi̇lmek İçi̇n Yeni̇ Bi̇r Yöntem Öneri̇si̇: Üçgen Plaka Yöntemi̇

Türker¹

2015

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

ÖZETBu çalışmada, çimento esaslı malzemelerin çekme dayanımının belirlenmesi için iki eksenli gerilme altında ölçülen yeni bir metot önerilmiştir. Bu metotta çimento esaslı numuneler eşkenar üçgen plaka şeklinde hazırlanmaktadır. Üretilen üçgen plaka numune, üç adet küçük çelik bilye üzerine mesnetlenmiş ve numunenin üst bölgesinde ağırlık merkezine yerleştirilen küçük çelik bir bilye yardımı ile de yükleme yapılmıştır. Üçgen plaka numunelerin geometrik özellikleri, mesnetlenme ve yükleme durumları belirlenmiş, plaka numunenin taşıma kapasitesi ile malzemenin çekme dayanımı arasında ilişki kurulmuştur. Malzemenin çekme dayanımı için plastisite teorisinin kinematik bir yöntemi olan akma çizgileri yöntemi yardımıyla kapalı formda basit bir analitik formül türetilmiştir. Çekme dayanımını belirleyebilmek için önerilen formülü doğrulamak amacı ile çok sayıda harç üçgen ve prizma numunesi hazırlanarak test edilmiş ayrıca üçgen plaka numuneleri için Sonlu Elemanlar Modelli (SEM) oluşturulmuştur. Deneysel çalışma ve SEM sonuçlarının, önerilen yöntemin iki eksenli çekme dayanımını belirlemede kullanılabileceği görülmüştür. Deneysel sonuçlar, önerilen metotla belirlenen çift eksenli çekme dayanımının üç nokta eğilme deneyiyle belirlenen eğilmede çekme dayanımı değerinden %22 kadar daha düşük olduğunu göstermiştir.Anahtar Kelimeler: Üçgen plaka yöntemi; iki eksenli çekme dayanımı; çimento esaslı malzemeler; sonlu elemanlar yöntemi; akma çizgisi teorisi A NEW TEST METHOD FOR BIAXIAL TENSILE STRENGTH OF CEMENT BASED MATERIALS: TRIANGULAR PLATE METHOD ABSTRACTIn this paper, a new test method to determine biaxial flexural tensile strength of cement based materials is proposed. A mortar triangular plate specimen is supported on three small spherical silver balls and loaded externally on a small spherical silver ball from the center of gravity of specimen. Yield line theory (YLT), which is a kinematic method of plastic analysis, is used to drive a simple equation for biaxial flexural tensile strength of cement based materials. In order to verify the derived equation, lots of triangular and prism mortar specimens were produced and tested according to the proposed model and three-point flexural test, respectively. Moreover, finite element analysis is also used to verify the derived equation and the results obtained from the experimental studies. It was concluded that FE analysis and experimental studies verified the proposed method and the derived closed-form equation for biaxial tensile strength of cement based materials. Experimental results also exhibited that biaxial tensile strength measured by proposed method is about 22% lower than that of the flexural strength obtained from three-point flexural test.

show abstract

Section: üçGen Plaka Yöntemi̇ (Triangular Plate Method)unclassified

Çi̇mento Esasli Malzemeleri̇n Çekme Dayanimlarini Bulabi̇lmek İçi̇n Yeni̇ Bi̇r Yöntem Öneri̇si̇: Üçgen Plaka Yöntemi̇

Türker¹

2015

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

View full text Add to dashboard Cite

show abstract

“…The mechanical strength of 16F, 16M and 27C cemented carbides was evaluated by biaxial flexural tests using the B3B method [25,26]. This method is widely used for brittle materials (e.g.…”

Section: Evaluation Of the Mechanical Strengthmentioning

confidence: 99%

Influence of temperature on the biaxial strength of cemented carbides with different microstructures

Chicardi

Bermejo

Gotor

et al. 2018

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

Abstract. The effect of the temperature on the mechanical strength of WC-Co cemented carbides with different microstructures (grain size and binder content) was evaluated. Biaxial flexural tests were performed on three cemented carbide grades at 600°C using the ball-on-three-balls (B3B) method. Results were interpreted by Weibull statistics and compared to biaxial strength results at room temperature. A detailed fractographic analysis, supported by Linear Elastic Fracture Mechanics, was performed to differentiate the nature and size of critical defects and the mechanism responsible for the fracture. A significant decrease in the mechanical strength (around 30%) was observed at 600ºC for all grades of cemented carbides. This fact was ascribed to the change in the critical flaw population from sub-surface (at room temperature) to surface defects, associated with the selective oxidation of Co. Additionally, an estimation of the fracture toughness at 600°C was attempted for the three cemented carbides, based upon the B3B strength results, the corresponding number of the tested specimens fragments and the macroscopic area of the B3B fracture surfaces. The fracture toughness was not ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T2 affected by the temperature, at least up to 600ºC. In addition, the good agreement with the Single Edge Notch Beam toughness data suggests the possibility of employing this approach for fracture toughness evaluation of brittle materials under different testing conditions.

show abstract

“…The flexural strength was measured under uniaxial stress using the ball on three balls test (B3B-test) [24][25][26][27][28], where a disc specimen is supported on three balls and loaded symmetrically by a fourth ball. In this loading situation, the three-point support guarantees three well-defined point contacts.…”

Section: Mechanical Testingmentioning

confidence: 99%

Effect of sintering time on the microstructure and mechanical properties of (Ti,Ta)(C,N)-based cermets

Chicardi

Torres

Córdoba

et al. 2013

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

Complete solid-solution cermets based on titanium-tantalum carbonitride using a starting nominal composition with 80 wt.% of (Ti 0.8 Ta 0.2 )(C 0.5 N 0.5 ) and 20 wt.% of Co were performed by pressure-less sintering at 1550 ºC for different times (from 0 to 180 min) in an inert atmosphere. Chemical and phase analyses were conducted using X-ray diffraction (XRD), elemental analysis and energy dispersive X-ray spectrometry (EDX).The binder mean free path and the contiguity of the carbonitride particles were used to rationalise the microstructural effects of the mechanical behaviour. Mechanical characterisation included determining the Vickers hardness, the fracture toughness (conventional indentation microfractures, IM), the dynamic Young's modulus (ultrasonic technique), the biaxial strength (ball on three ball) and a detailed fractographic examination. Finally, the experimental findings were combined with a theoretical fracture mechanics analysis to estimate the critical processing flaw sizes.Binder-less carbonitride clusters, pores and coarse carbonitride grains were the main defects observed and were responsible for the fractures.

show abstract

The ball on three balls test—Strength and failure analysis of different materials

Cited by 119 publications

References 10 publications

Çi̇mento Esasli Malzemeleri̇n Çekme Dayanimlarini Bulabi̇lmek İçi̇n Yeni̇ Bi̇r Yöntem Öneri̇si̇: Üçgen Plaka Yöntemi̇

Çi̇mento Esasli Malzemeleri̇n Çekme Dayanimlarini Bulabi̇lmek İçi̇n Yeni̇ Bi̇r Yöntem Öneri̇si̇: Üçgen Plaka Yöntemi̇

Influence of temperature on the biaxial strength of cemented carbides with different microstructures

Effect of sintering time on the microstructure and mechanical properties of (Ti,Ta)(C,N)-based cermets

Contact Info

Product

Resources

About