Subcritical Crack Growth in a Phosphate Laser Glass

Crichton, S.N.; Tomozawa, M.; Hayden, Joseph S.; Suratwala, Tayyab; Campbell, J. H.

doi:10.1111/j.1151-2916.1999.tb02208.x

Cited by 65 publications

(44 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The internal WSC is not the only mechanism to explain the direct bonding energy increase but it seems to play an important role in the mechanical evolution of the bonding interface. Moreover, as the WSC is even more efficient at high temperature, 13 this mechanism might be more and more efficient during the post bonding annealing. The bonding mechanism of Si/SiO 2 or SiO 2 /SiO 2 plasma bonding might then be the same as for the chemical bonding but at lower temperature thanks to the specific plasma sub-subsurface.…”

Section: Wsc and Direct Bonding Mechanismmentioning

confidence: 99%

“…The water stress corrosion may help the surface asperities to deform in order to increase the bonding area and thus the bonding energy. Furthermore, as the water stress corrosion rate depends on the temperature, 13 it could also participate to the bonding energy evolution versus annealing temperature. The direct bonding mechanism * Electrochemical Society Student Member.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Water Stress Corrosion in Bonded Structures

Fournel

Martin-Cocher

Radisson

et al. 2015

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

Direct bonding is now a well-known technique to join two flat surfaces without any additional material. This technique is used in many applications and especially in SOI (Silicon-On-Insulator) elaboration or in some backside imager manufacturing processes which are now almost in mass production. Direct bonding mechanism study is then very important in order to clearly understand this bonding behavior. Especially in the case of silicon or silicon dioxide hydrophilic surface, the role of water is essential. Water could lead to lots of different reactions at the bonding interface and especially the water stress corrosion could play an important role in the direct bonding mechanism.

show abstract

Section: Wsc and Direct Bonding Mechanismmentioning

confidence: 99%

mentioning

confidence: 99%

Water Stress Corrosion in Bonded Structures

Fournel

Martin-Cocher

Radisson

et al. 2015

ECS J. Solid State Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…In other materials, such a glass, it is often reported that the crack initiates at the crowns of the hole without the presence of a starter notch (Janssen 1974; Michalske and Fuller 1985;Crichton et al 1999), while in polymers such as PMMA, a starter notch is necessary to initiate cracking at the crowns. Various schemes were undertaken in an effort to initiate a stable crack.…”

Section: Methodsmentioning

confidence: 98%

Compression-induced axial crack propagation in DCDC polymer samples: experiments and modeling

2006

View full text Add to dashboard Cite

The fracture strength of PMMA is studied using columns with rectangular crosssection that contain a central hole and are subjected to axial compression. Samples with geometries such that the width is 2, 3, 4, and 5 times the diameter of the hole are investigated. Cracks are initiated by introducing sharp notches in the axial direction at the crowns of the hole in each sample. The sample is then subjected to axial compression such that the axial cracks grow in a stable manner until a critical compression is attained, after which the cracks extend rapidly in the sample but do not reach its ends. To predict the experimental results, we have first sought to use several published models, but discovered that none would produce results in accord with our data, as they seem not to address the essential features of our beam-column experiments. We have then developed a simple model that consists of a suitably modified version of an elasticity solution based on a short-crack in an infinite plate, combined with a beam-column solution for a long-crack. This model yields results in good accord with our data and also gives reasonable values for the fracture toughness of the material. A comparative discussion of several published models is presented at the end of the paper, pointing out that linear elasticity is not an appropriate tool for solving the present beam-column problem.

show abstract

“…To explore this question we used the direct cleavage double compression (DCDC) method to grow a matching pair of isolated fracture surfaces. [9,21] Surprisingly, unlike indentation fractures, very little FPL signal was observed on the fracture surfaces produced using the DCDC technique. The high damage threshold of the fractures produced using the DCDC method was similar to that of a fracture free polished surface.…”

Section: Discussionmentioning

confidence: 99%

Thermal annealing of laser damage precursors on fused silica surfaces

et al. 2012

Self Cite

View full text Add to dashboard Cite

Previous studies have identified two significant precursors of laser damage on fused silica surfaces at fluenes below ~35J/cm 2 , photoactive impurities in the polishing layer and surface fractures. In the present work, isothermal heating is studied as a means of remediating the highly absorptive, defect structure associated with surface fractures. A series of Vickers indentations were applied to silica surfaces at loads between 0.5N and 10N creating fracture networks between ~10m and ~50m in diameter. The indentations were characterized prior to and following thermal annealing under various time and temperature conditions using confocal timeresolved photo-luminescence (CTP) imaging, and R/1 optical damage testing with 3ns, 355nm laser pulses. Significant improvements in the damage thresholds, together with corresponding reductions in CTP intensity, were observed at temperatures well below the glass transition temperature (T g ). For example, the damage threshold on 05.N indentations which typically initiates at fluences <8 J/cm 2, could be improved >35 J/cm 2 through the use of a ~750 °C thermal treatment. Larger fracture networks required longer or higher temperature treatment to achieve similar results. At an annealing temperature >1100°C, optical microscopy indicates morphological changes in some of the fracture structure of indentations, although remnants of the original fracture and significant deformation was still observed after thermal annealing. This study demonstrates the potential of using isothermal annealing as a means of improving the laser damage resistance of fused silica optical components. Similarly, it provides a means of further understanding the physics associated with optical damage and related mitigation processes.

show abstract

Subcritical Crack Growth in a Phosphate Laser Glass

Cited by 65 publications

References 17 publications

Water Stress Corrosion in Bonded Structures

Water Stress Corrosion in Bonded Structures

Compression-induced axial crack propagation in DCDC polymer samples: experiments and modeling

Thermal annealing of laser damage precursors on fused silica surfaces

Contact Info

Product

Resources

About