Padmanabhan Krishnan

11 Questions 15 Answers 0 Followers

Questions related from Padmanabhan Krishnan

Why is it that all failure theories in composites are dry and not after hygrothermal degradation ?

Hygrothermal degradation makes a polymer composite more viscoelastic . So, the failure criteria equations should change for the sake of durability.

02 August 2023 9,277 1 View

PLease read my chapter contribution on the Viscoelastic response of polymers to sliding contacts. Why is it that this discovery was missed earlier ?

PLease read my chapter contribution on the Viscoelastic response of polymers to sliding contacts. Why is it that this discovery was missed earlier ? Every tribologist has been doing the wear...

11 April 2023 2,723 0 View

Which is the best software to simulate chemistry of materials in correlation with their mechanical properties ?

ANSYS or ABAQUS donot correlate materials chemistry wirh the observed or simulated mechanical properties. Is there a software that can do this structure to property correlation. ?

23 September 2020 1,324 3 View

Why did it take humanity so long to start writing though we have been speaking for tens of thousands of years ?

They say we were just speaking and not writing anything for tens of thousands of years till a basic form of writing evolved just about ten thousand years back. Why this yawning gap ?

23 September 2020 5,441 7 View

How to simulate impact resistance and local damage in thick sections of laminates and shells against ballistic velocities in ABAQUS ?

What are the models and formulations that would help in the simulation of impact resistance and local damage in thick sections of laminated composities using ABAQUS ?

23 September 2020 3,567 0 View

Why is it that only UHMWPE is popular but not UHMWPP or UHMWNYLON ? What are the issues ?

The world attention is now on ultralight composites where matrix materials and fibres like UHMWPE which are lighter than water are used to make Self reinforced composites. But there is a dearth...

09 January 2019 294 1 View

How good are the carbon and graphitic foams for structural applications ?

Any comparisons with the other foams in mechanical properties and thermal properties ? Do they come in coated forms and who are the suppliers in India ?

26 September 2016 9,564 1 View

I want to know whether any light foam is superior to PMI ( Rohacell) in thermomechanical properties ?

15 September 2016 8,843 1 View

Why is it that woolly mammoths disappeared near Kashmir more recently than any other part of the globe, if so ?

It is said that just near and above Kashmir some woolly mammoth skeletons were unearthed. They were said to be alive as late as 10,000-15,000 BP. But their extinction elsewhere was much earlier,...

26 August 2016 9,841 1 View

In laminated composites, flexure is not just a material property but also a laminate property-means it is layer dependent.Why no predictive models ?

Flexural properties of laminated composites are layer dependent. For example, the flexural strength of a 4 layer/ 3mm thick/ 0.5b volume fraction is different from a 24 layer/ 3mm thick/0.5 volume...

25 January 2016 327 5 View

Einstein, ECG Surashan and Stephen Hawkings were right in their perspectives. Your opinion ?

Do we really like limits, believe in them or can we prove that anything in this universe has its limits . What if we think what we know is the limit ? Limits get pushed sometimes when we know...

01 January 1970 6,634 1 View