Tensile Fracture Strength of ST Cut Quartz

Chao, Han; Parker, T.E.

doi:10.1109/freq.1983.200654

Cited by 9 publications

(5 citation statements)

References 3 publications

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“…The tensile strength of quartz is ca. 150 MPa (Chao & Parker, 1983), similar to that for the San Marcos gabbro with 68% plagioclase (Ai & Ahrens, 2004). Using this value, the maximum differential stress for tensile failure in a quartzo‐feldspathic rock, such as AW9, is ca.…”

Section: Discussionsupporting

confidence: 57%

Time‐Lapse Record of an Earthquake in the Dry Felsic Lower Continental Crust Preserved in a Pseudotachylyte‐Bearing Fault

2022

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Earthquakes recorded in the lower continental crust present a major conundrum with regard to rock mechanics and earthquake mechanisms because they occur well below the depth of the usual frictional to viscous (or brittle to ductile) transition. The properties and mechanical processes of these lower crustal earthquakes have generally been inferred from geophysical data, from laboratory experiments, or from analytical and numerical models. Complementary information comes from the study of exhumed rocks and in particular of pseudotachylytes, which are special fault rocks widely recognized as quenched melts produced during coseismic slip in silicate rocks (e.g.,

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Section: Discussionsupporting

confidence: 57%

Time‐Lapse Record of an Earthquake in the Dry Felsic Lower Continental Crust Preserved in a Pseudotachylyte‐Bearing Fault

2022

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“…When the V-shaped beam thickness is 80 μm, the stress value emerged by the shock in the Z− shock direction is the largest at 94.721 MPa; when the V-shaped beam thickness is 75 μm, the stress value emerged by the shock in the same direction is the largest, at 100.512 MPa. Limited by the fracture strength of quartz crystal materials (95 MPa) [ 27 , 28 ], the minimum thickness of the V-shaped beam is 80 μm.…”

Section: Modeling Simulation and Analysismentioning

confidence: 99%

Development of V-Shaped Beam on the Shock Resistance and Driving Frequency of Micro Quartz Tuning Forks Resonant Gyroscope

Bai

Zhao

2020

Micromachines

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The application of gyroscopes in harsh environments has always been a hot topic. As a high-quality material for manufacturing gyroscopes, quartz crystals need to be designed and optimized to meet the normal operation of gyroscopes in harsh environments. The Micro Electronics Mechanical System(MEMS) quartz tuning forks resonant gyroscope is one of the quartz gyroscopes. The elastic structure (V-shaped beam) between the anchor support point and tuning forks plays a vital role in the MEMS quartz tuning forks resonant gyroscope. This structure determines the natural frequency of the gyroscope, and more importantly, determines the shock resistance of the gyroscope structure. In this article, the MEMS quartz tuning forks gyroscope with different V-shaped beam thicknesses are simulated and analyzed by finite element analysis simulation software. After the modal analysis and shock simulation (the half-cycle sine shock pulse with amplitude of 1500 g (g is the acceleration of gravity) and duration of 2 ms in the six shock directions), the results show that when the beam thickness is 80 μm, the maximum stress is 94.721 MPa, which is less than the failure stress of quartz crystal. The gyroscope’s shock resistance is verified through shock testing.

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“…Both SAW and FBG sensors are able to monitor between -20 °C and +80 °C, which is an adequate temperature range for most civil engineering applications. While FBG sensors can monitor strains as high as 3 e m [34], SAW sensor strain ranges are limited by the strength of the quartz substrate to 0.5-1 e m with more polished substrates demonstrating higher strengths [19]. For high strain monitoring applications, strength limitations can be overcome through sensor packaging design, as described in section 3.3.…”

Section: Measurement Resolution and Rangementioning

confidence: 99%

“…SAW sensors have historically been used to monitor aircraft component cracking [16], rebar corrosion [17], and tyre pressure [18], but their application to strain and displacement monitoring in civil structures, particularly in concrete, has been limited. The reasons for this include the fact that the brittleness of SAW sensors significantly limits their measurement range [19]. There are also challenges associated with bonding the sensors to the non-uniform and low precision geometries of concrete structures [20].…”

Section: Introductionmentioning

confidence: 99%

Wireless surface acoustic wave sensors for displacement and crack monitoring in concrete structures

Perry

Mckeeman

Saafi

et al. 2016

Smart Mater. Struct.

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In this work, we demonstrate that wireless surface acoustic wave devices can be used to monitor millimetre displacements in crack opening during the cyclic and static loading of reinforced concrete structures. Sensors were packaged to extend their gauge length and to protect them against brittle fracture, before being surface-mounted onto the tensioned surface of a concrete beam. The accuracy of measurements was verified using computational methods and optical-fibre strain sensors. After packaging, the displacement and temperature resolutions of the surface acoustic wave sensors were 10 µm and 2 • C respectively. With some further work, these devices could be retrofitted to existing concrete structures to facilitate wireless structural health monitoring.

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Tensile Fracture Strength of ST Cut Quartz

Cited by 9 publications

References 3 publications

Time‐Lapse Record of an Earthquake in the Dry Felsic Lower Continental Crust Preserved in a Pseudotachylyte‐Bearing Fault

Time‐Lapse Record of an Earthquake in the Dry Felsic Lower Continental Crust Preserved in a Pseudotachylyte‐Bearing Fault

Development of V-Shaped Beam on the Shock Resistance and Driving Frequency of Micro Quartz Tuning Forks Resonant Gyroscope

Wireless surface acoustic wave sensors for displacement and crack monitoring in concrete structures

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