Cyclic fatigue of ceramics

Guiu, F.; Reece, Michael J.; Vaughan, D. A.

doi:10.1007/bf01124674

Cited by 86 publications

(30 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, under cycling loading, their contibution to crack-growth reistance may be progressively diminished due to a decay of the frictional sliding resistance of the matrix/bridge interfaces. While detailed models of the micromechanics of such timedependent bridging phenomena are at present not well developed, some preliminary observations [2,7,[34][35][36][37][38] seem to suggest that wear processes during repeated sliding under the action of the cyclic loads may significantly reduce the bridging capacity of the bridging zone.…”

Section: Mechanisms Of Crack Growthmentioning

confidence: 99%

Cyclic fatigue-crack propagation in a silicon carbide whisker-reinforced alumina composite: role of load ratio

Dauskardt

Dalgleish

Yao

et al. 1993

JOURNAL OF MATERIALS SCIENCE

View full text Add to dashboard Cite

Section: Mechanisms Of Crack Growthmentioning

confidence: 99%

Cyclic fatigue-crack propagation in a silicon carbide whisker-reinforced alumina composite: role of load ratio

Dauskardt

Dalgleish

Yao

et al. 1993

JOURNAL OF MATERIALS SCIENCE

View full text Add to dashboard Cite

“…Así, se obtiene un valor de n = 53 ± 9, que es similar a los valores que se encuentran en la literatura, entre 40 [37] y 60 [52]. Análogamente, si analizamos los datos de contacto cíclico con el mismo tipo de expresión, obtenemos valores de exponentes de Paris iguales a 22 ± 4, similares a los obtenidos por Guiu [47,53] entre 13 y 20, o los obtenidos por Nagl y col [54], iguales a 22.…”

Section: Resultados Y Discusiónunclassified

Fatiga por contacto esférico en materiales multicapa de alúmina circona

Piqué¹,

Gomila²,

Chalvet³

et al. 2005

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

Es usual que en aplicaciones reales los materiales cerámicos sufran fatiga por contacto. Una estrategia para mejorar su resistencia a la aparición de fatiga por contacto es la utilización de materiales con tensiones residuales de compresión en la superficie. En concreto, en este trabajo se presenta el estudio de la resistencia al contacto esférico estático y cíclico de un cerámico multicapa de alúmina y alúmina / circona producido por colaje en cinta, en el que aparecen tensiones residuales debido al desajuste entre los coeficientes de expansión térmica de las capas. También se estudia una alúmina monolítica con objeto de realizar comparaciones con un material sin tensiones residuales. Se muestra que la resistencia a la aparición de grieta anillo es mayor en el caso del material multicapa que en el de la alúmina, tanto en contacto estático como cíclico. También se muestra que existe fatiga mecánica en los dos materiales bajo contacto cíclico, y no sólo corrosión bajo tensión. Finalmente se propone una relación simple entre carga aplicada y tiempo hasta aparición de daño. Hertzian fatigue in alumina/zirconia laminated compositesIn some engineering applications, ceramic materials are subjected to contact fatigue. In order to improve the resistance of ceramics to contact fatigue, it is proposed to use ceramic laminates with residual stresses at the surface. In this work, the Hertzian contact fatigue of an alumina-alumina/zirconia laminated composite produced by tape casting is studied, both under static loading and cyclic loading, together with a monolithic alumina for comparison purposes. It is shown that the laminate composite presents better resistance to the apparition of surface ring crack, due to the residual stresses of the laminate composite. It is also shown that there is a fatigue effect on both materials under cyclic loading, and not only stress corrosion cracking. A simple relationship between applied load and time to apparition of damage is finally proposed.Keywords: Laminated composites. Alumina, Zirconia, Hertzian contact, Fatigue, Stress corrosion cracking INTRODUCCIÓNEl uso de materiales cerámicos en aplicaciones reales se ve obstaculizado por su baja tenacidad y su gran dispersión en valores de resistencia mecánica, lo que compromete la integridad estructural de los componentes en servicio. Así, desde hace varias décadas se trabaja extensivamente en aumentar la tenacidad de las cerámicas, ya sea controlando la calidad de la microestructura, y por tanto, la población de defectos susceptibles de iniciar el fallo catastrófico, o haciendo que el material sea más resistente a la propagación de grietas una vez iniciadas, (mediante, por ejemplo transformaciones de fase), o fabricando composites cerámicos, ya sea con microestructuras dúplex, fibras o cerámicas multicapa. Estas cerámicas multicapa son una alternativa prometedora, ya que presentan valores altos de tenacidad y, en ciertos casos, la capacidad de frenar el crecimiento de grieta una vez iniciada ésta [1, 2, 3].La estrategia más utilizada en lo...

show abstract

“…Besides static fatigue, the effect of thick films on other aspects, such as the threshold levels for subcritical crack growth [26] and cyclic fatigue [37,38] should also be investigated. For SCG, switching from purely static to constant-rate (dynamic) loading tests [20] is desirable, as such tests obviate the problem of early failures and surviving samples and the corresponding complex data analysis.…”

Section: Discussionmentioning

confidence: 99%

Long-term mechanical reliability of ceramic thick-film circuits and mechanical sensors under static load

Maeder

Jacq

Ryser

2012

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

In this work, we study the long-term mechanical strength under static load -i.e. static fatigue performance or resistance to subcritical crack growth -of ceramic thick-film circuits, namely how the static fatigue of the substrate is affected by the presence of thick-film compositions on the surface subjected to tensile stress. Three substrate materials were compared: standard 96% alumina (Al 2 O 3 ) and two grades of high-strength zirconia-toughened alumina (ZTA). The tested thick-film compositions included Ag-and Au-based conductors, a multilayer dielectric, resistors, and an overglaze, alone or in combination. The tests were carried out by applying a nominally constant load on cantilevers, at room temperature and in nominally 100% humidity, with stress data extracted according to log-normal and Weibull statistics. In the blank state, both ZTA grades exhibit higher short-term strength than 96% Al 2 O 3 , as well as much higher resistance to static fatigue. However, many thick-film compositions are found to degrade the static fatigue performance, with higher-strength ZTA being in general more affected. This implies that thick-film materials used in circuits under high mechanical stress, such as force and pressure sensors and devices operating in harsh environments, must be carefully chosen and placed in order to ensure reliable long-term operation.

show abstract

Cyclic fatigue of ceramics

Cited by 86 publications

References 28 publications

Cyclic fatigue-crack propagation in a silicon carbide whisker-reinforced alumina composite: role of load ratio

Cyclic fatigue-crack propagation in a silicon carbide whisker-reinforced alumina composite: role of load ratio

Fatiga por contacto esférico en materiales multicapa de alúmina circona

Long-term mechanical reliability of ceramic thick-film circuits and mechanical sensors under static load

Contact Info

Product

Resources

About