Mathematica: Unusual piecewise plot issue -

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hello , in advance,

i came upon issue trying plot piecewise function in mathematica. when entered directly plot function, piecewise did not plot. however, when defined piecewise variable, did plot. why issue occurring , can still join plot? (i join setting exclusions none)

the following code: (i define maxwell strain function , trying model plastic deformation of polymer on multiple stress cycles)

z = 2*10^10;   h = 10^12;   maxwellstrain[s_, t_] := s/z + (s*t)/h;   stress = {0, 10^7, -10^7, 5*10^6, 10^7, -5*10^6};   time = {0, 100, 200, 300, 400, 500};   strainlist = join[{0}, table[maxwellstrain[stress[[i + 1]], t - time[[i]]], {i, 1, 5}]];  plot[  piecewise[   table[{     total[strainlist[[1 ;; + 1]]], time[[i]] < t < time[[i + 1]]},    {i, 1, 5}    ],   exclusions -> none]  ,  {t, 0, 500}  ]  x = piecewise[   table[{     total[strainlist[[1 ;; + 1]]], time[[i]] < t < time[[i + 1]]},    {i, 1, 5}    ],   exclusions -> none]  plot[x, {t, 0, 500}]

the following output: (first plot doesn't show, second does)

output:
output - screenshot

thank help, sv


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