Is strengthening by quenching performed on ceramic materials?

Glass is typically surface hardened by a compressive residual surface stress due to quenching. Is such a physical strengthening process also possible on other ceramic materials such as Alumina and...

31 December 2016 10,012 26 View

Where is shot peening of ceramics performed?

By shot peening the surface of objects can be compressively stressed. This is normally done using metal targets, however the same process can also be applied on ceramics. Where is shot peening on...

09 October 2016 5,659 12 View

Can ceramics be chemically hardened (tempered)?

Glass is regularly hardened by thermal or chemical methods. Using a molten salt the Si ions can be exchanged by larger K or Na ions which results in a compressed outer surface of the...

07 August 2016 5,580 14 View

Is the density of an amorphous material always lower than its crystalline phases?

Normally the crystalline phase of a matter has a higher density compared to its liquid state (and therefore the solid phase sinks in its liquid). Ice may be an exception (as its density is lower...

01 February 2016 4,903 6 View

Is natural aging of AA6082-T651 possible?

Would it be possible for the aluminium alloy AA6082-T651 to increase in strength/hardness over time (years)? Or are the mechanical properties stable over such long periods at room temperature storage?

31 December 2015 3,208 4 View

What controls the cone-angle in brittle materials that experience a Hertzian stress distribution?

If a brittle material is locally compressed (statically, or dynamically) a ring crack starts at the surface. Due to the stress distribution in the bulk of the material, the ring crack growth at an...

09 October 2015 326 9 View

How can I change cone crack angle in brittle material with Herzian stress distribution ?

09 October 2015 4,543 9 View

How to remove Polyurethane resin (PUR) from glass?

A 3 mm thick layer of Polyurethane is adhered to a glass plate (10 mm thickness). Are there any chemicals that will dissolve the PUR or make detachment from the glass surface easier?

08 September 2015 4,661 7 View

How can I remove a TPU from a glass surface?

Glass laminates are often produced using bond films like PVA, PVB and TPU (thermoplastic polyurethane). Some of these bond films are rather thick (mm range) and adhere well on the glass...

07 August 2015 1,513 8 View

How can I measure transversal sound velocity in LD-PE?

I used 2.4 MHz transducers to measure the longitudinal and transversal sound velocities in low density polyethylene (LDPE) with a plate thickness of 8 mm. The longitudinal sound velocity was...

06 July 2015 9,888 3 View

How two melting peaks in DSC of polypropylene can be merged into one crystallization peak?

The figure shows DSC cooling (blue) and 2nd heating (green) curves (step: 10 K/min) for a commercial sample supplied as Atactic Polypropylene (APP). The heating curve illustrates two major...

03 March 2021 5,857 3 View

Why Austenite grains in steel show much more twinning than ferrite grains?

It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why...

02 March 2021 728 2 View

What thickness need for ITO to use as conductive layer?

I want to do RF sputtering of ITO on glass substrate using magnetron sputtering. what thickness do i need to make it good conductive layer to use it for PSC. Moreover, whats about thickness of...

01 March 2021 395 3 View

How to simultaneously perform multiple biochemical assays?

I am a research scholar working on heavy metal stress on plants. I will be doing biochemical characterisation( protein, carbohydrate, proline, antioxidant enzymes and many more assays) at interval...

01 March 2021 6,999 3 View

Glass fiber content in a gypsum board ?

Any idea on how to get the volumic ratio of glass fiber in a gypsum board ? Thank you for your help !

01 March 2021 2,501 3 View

What is the most suitable server for predicting protein structures in bacteria?

I have used the i-Tasser several times, however it has been unavailable for several days. I tried the swiss-model, but the output was not very pleasant due to the model used. Is there any other...

28 February 2021 4,521 3 View

Concrete compressive strength databases?

I am looking for datasets similar to this one: http://archive.ics.uci.edu/ml/datasets/Concrete+Compressive+Strength I am looking for concretes with different types of aggregates (Recycled,...

27 February 2021 6,801 3 View

How to replicate the well conditions of a crystal hit with 20%(w/v) isopropanol?

I had a crystal hit in a well with 0.1M HEPEs pH 7.5, 10%(w/v) PEG 4000, and 20%(w/v) isopropanol. Why is isopropanol in w/v here if it's just solvent? How do I recreate this well condition?

25 February 2021 9,761 1 View

How to properly calculate the fluid solid heat transfer between polypropylene matrix and glass fiber in a porous medium?

I'm building a cfx model of thermoplastic pultrusion process on ansys and i have a doubt on how is the proper way to set this parameter in a porous medium

24 February 2021 1,915 1 View

Why is NH4OH added in heavy metals limit test?

The limit test I'm referring to is USP method II. In this procedure you need to dropwise add 6N of NH4OH to the sample until it the pH is alkali. After that you need to dilute and add HOAc until...

23 February 2021 2,049 3 View