Abstract
The creep and stress relaxation behavior of rice husk reinforced low density polyethylene composite was analyzed in this study. The exponential and power model were used to study the creep while the stress relaxation assessed the time required for the composites to maintain a certain strain level. The creep strain increased with increase in time, at various temperatures, with its highest creep at 70oC while the lowest is at 30oC, the power model provided an excellent fit than other models with a coefficient of determination of 0.9977 at 30oC, the neat low density polyethylene had a good stress relaxation behavior with 4.95 seconds for it to decay and subsequently decreased with increase in filler concentration.
Highlights
Deformation of materials over time when acted upon by constant stress is termed creep, the resultant stress continually increased with increase in time, its counterpart, stress relaxation occurs when stress decreases under constant strain over time
Riara et al (2013) analyzed the creep and stress relaxation behavior of cellulose reinforced lowdensity polyethylene composites at different cellulose loading and temperature, the creep performance decreased with increase in temperature and improved with cellulose loading while creep modulus decreased with increase in time and temperature
The stress relaxation revealed that the amount of load to maintain a certain strain level in the composite decreases with time, It can be postulated that decay increased with increased filler content and occurred at a reduced time interval, this indicates that the molecules chains need to stretch and slide more quickly at large strain level (Qi et al, 2018; Zhang et al, 2017)
Summary
Deformation of materials over time when acted upon by constant stress is termed creep, the resultant stress continually increased with increase in time, its counterpart, stress relaxation occurs when stress decreases under constant strain over time. Both occur in materials such as metals and polymers, temperature-dependent, though polymers are more susceptible to creep deformation due to its viscoelastic property (Callister, 2007). Factors such as time and temperature have a significant effect on the viscoelastic properties of the polymeric matrix which determines the mechanical behavior of composites (Rowel et al, 2001; Nwosu-Obieogu et al, 2016). Monticeli et al (2019) carried out creep/recovery and stress-relaxation tests in a standardized carbon fiber/epoxy composites, and the result confirmed that temperature is a determinant factor to creep and stress relaxation properties. Riara et al (2013) analyzed the creep and stress relaxation behavior of cellulose reinforced lowdensity polyethylene composites at different cellulose loading and temperature, the creep performance decreased with increase in temperature and improved with cellulose loading while creep modulus decreased with increase in time and temperature. Lechat et al (2011) studied the tensile and creep properties of polyethylene terephthalate and naphthalate fibers and there was a similarity in the creep rate value for both fibers
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