Why "in some cases" does toughness of polymer-filler nanocomposites reduces with increased tensile strenght? knowing that this trend is quasi-linear with an increased filler content.
Toughness is the amount of energy that can be absorbed by the material until its failure. You can estimated this by the area under the curve of stress vs strain.
Altough the addition of filler increase strength (ability to resist stress) and stiffness (modulus), the strain or ductility will greatly reduces due to the brittle nature of filler. You can induce pseudo-ductiliy in brittle material by using crack deflection method or energy dissipation. I just published a review including this crack deflection strategy in polymer nanocomposites. Please kindly have a look https://www.researchgate.net/publication/331173157_Polymer_Nanocomposites_Having_a_High_Filler_Content_Synthesis_Structures_Properties_and_Applications
Hi
In my view.
The toughness and tensile strength both are different in its nature and science. The tensile strength is nothing but the ability of load transfer and withstandability. The toughness is nothing but energy absorption. Generally tensile strength and toughness are matrix and reinforcement dependent . so when you add fillers the energy absorption decrease with more stress concentrations while tensile strength may lightly increase.
Best.
Typically strength is dependent on the interfacial interactions which can be increased with surface functionalities and so on. Toughness is dependent on the length of the reinforcement. There is a critical length of the reinforcement that will benefit all three. Below paper may be useful.
Article Nanocomposite toughness, strength and stiffness: role of fil...
Toughness is the amount of energy that can be absorbed by the material until its failure. You can estimated this by the area under the curve of stress vs strain.
Altough the addition of filler increase strength (ability to resist stress) and stiffness (modulus), the strain or ductility will greatly reduces due to the brittle nature of filler. You can induce pseudo-ductiliy in brittle material by using crack deflection method or energy dissipation. I just published a review including this crack deflection strategy in polymer nanocomposites. Please kindly have a look https://www.researchgate.net/publication/331173157_Polymer_Nanocomposites_Having_a_High_Filler_Content_Synthesis_Structures_Properties_and_Applications
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