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Fused Quartz Calculators

Internal Pressure Stress Calculator

Determine Thickness

Thickness:

mm Please Enter Data

Determine Internal Pressure

Pressure:

PSI Please Enter Data

Reasonable care must be taken in handling and use to protect glass (quartz) surfaces from scratches, abrasions, pits or digs that can act as break sources. Glass under stress will fail due to a break source. Therefore, surface preparation of glass exposed to thermal or mechanical stress is critical. Alternatively, defects that are smooth and exhibit a gentle surface change are less damaging. This calculator is based on accepted strength of material calculations for the geometry and conditions selected. It assumes good workmanship in the manufacture of components. The calculator should in no way be interpreted as a guarantee or a warranty of the quartz performance. It should be used along with prudent testing of designs.

 

This calculator can be used to determine the required wall thickness or the allowable internal pressure for a fabricated pressure vessel at low temperatures.

 

This calculator uses the thin wall approximation that is applicable when the wall thickness is less than about one tenth of the radius.

 

The calculator uses the relationship between the radius, thickness, and the applied internal pressure to determine the tangential (hoop) stress. The longitudinal stress is half of the tangential stress, so it is not calculated. These relationships only apply to sections of the pressure vessel significantly distant from the ends, since various nonlinearities and stress concentrations exist near these ends.

 

This calculator only considers internal pressure. Pressure vessels under external pressures must be analyzed for buckling and other modes of failure.

Material Comparator

Material selection in the design of fabricated-ware components is an important factor in achieving desired results. This comparator allows the user to quickly compare two materials for a specified property type.

Sag Deflection Calculator

Load Type

Temperature

Cross Section

Room Temperature Deflection

Maximum Stress

Stress / Maximum Design Stress

There are many factors in quartz component design and use conditions that can significantly impact the amount of sag in a quartz part. This calculator is a useful tool to compare the relative performance of different shapes, sizes and material types. The predicted sag may be different than actual experience, but it has proven to be a valid tool for comparison of different design features, such as rod diameter, and different materials (low hydroxyl quartz vs. high hydroxyl quartz).

 

This calculator can be used to estimate the amount of sag (deflection) in a horizontally supported quartz element.

 

Abstract:
Room temperature elastic deflection of quartz structures can be used to predict the sag in the structure at high temperature.

 

The difference between elastic and plastic deflection is compared and used to show that, for many structures, viscous sag is proportional to elastic deformation.

 

Reasonable care must be taken in handling and use to protect glass (quartz) surfaces from scratches, abrasions, pits or digs that can act as break sources. Glass under stress will fail due to a break source. Therefore, surface preparation of glass exposed to thermal or mechanical stress is critical. Alternatively, defects that are smooth and exhibit a gentle surface change are less damaging. This calculator is based on accepted strength of material calculations for the geometry and conditions selected. It assumes good workmanship in the manufacture of components. The calculator should in no way be interpreted as a guarantee or a warranty of the quartz performance. It should be used along with prudent testing of designs.

Window Thickness Calculator

Thickness

mm Please Enter Data

Minimum thickness required to keep stress in Quartz below 1,000 psi, the suggested design stress.

 

The results of the calculations above assume good workmanship in preparation of the glass (quartz) window. Reasonable care must be taken in handling and use to protect glass (quartz) surfaces from scratches, abrasions, pits or digs that can act as break sources. Glass under stress will fail due to a break source. Therefore, surface preparation of glass exposed to thermal or mechanical stress is critical. Alternatively, defects that are smooth and exhibit a gentle surface change are less damaging. This calculator is based on accepted strength of material calculations for the geometry and conditions selected. The calculator should in no way be interpreted as a guarantee or a warranty of the quartz performance. It should be used along with prudent testing of designs. A uniformly distributed load is assumed in the calculations.