包 inputenc 错误：使用的键盘字符未定义

Question

我有一行简单的文本，但出现了上述错误，我没有发现该行有什么奇怪的地方，你能帮我解决一下吗？我确定这不是再次阅读帮助的问题！非常感谢

\documentclass[11pt,a4paper,twoside,openright]{report}

\usepackage{setspace}
\usepackage{graphicx}
\usepackage{tabularx}
\usepackage{tabu}
\usepackage{subfigure}
\usepackage{afterpage}
\usepackage{amsmath,amssymb}            
\usepackage{rotating}  
\usepackage{fancyhdr}  
\usepackage[scriptsize]{caption} 
\hyphenation{a-gen-tiz-za-zio-ne}
\usepackage{float}
\usepackage[parfill]{parskip}
\usepackage{multicol}
\usepackage{siunitx}
\usepackage{amsmath}

\graphicspath{ {images/} }

\usepackage[a4paper,lmargin=2cm,rmargin=2cm]{geometry}

\newcommand*{\diff}{\mathop{}\!\mathrm{d}}

\newcommand*{\var}[1]{\texttt{#1}}

\usepackage[USenglish]{babel}
\usepackage[latin1]{inputenc}
\renewcommand{\captionfont}{\normalfont \sffamily \itshape \small}

\pagestyle{empty}



\begin{document}



   F.W.Zok \cite{R34} has analyzed metalic sandwich panels with textile cores  subject to combined bending and shear and then designed for minimum weight. Basic results for the weight benefits relative to solid plates are presented, with emphasis on restricted optimizations that assure robustness (non-catastrophic failure) and acceptable thinness. Select numerical simulations are used to check the analytical results and to explore the role of strain hardening beyond failure initiation. Comparisons are made with competing concepts, especially honeycomb and truss core systems. It is demonstrated that all three systems have essentially equivalent performance. The influence on the design of a concentrated compressive stress that might crush the core has been explored and found to produce relatively small effect over the stress range of practical interest. “Angle ply” cores with members in the $\pm \ang{45}$ orientation are found to be near optimal for all combinations of bending, shear and compression.

\end{document}

并且代码中的参考R34是：

@Article{R34,
  Title                    = {Design of metallic textile core sandwich panels },
  Author                   = {F.W. Zok and H.J. Rathbun and Z. Wei and A.G. Evans},
  Journal                  = {International Journal of Solids and Structures },
  Year                     = {2003},
  Number                   = {21},
  Pages                    = {5707 - 5722},
  Volume                   = {40},

  Doi                      = {http://dx.doi.org/10.1016/S0020-7683(03)00375-5},
  ISSN                     = {0020-7683},
  Keywords                 = {Sandwich panels},
  Url                      = {http://www.sciencedirect.com/science/article/pii/S0020768303003755}
}

Answer 1

尝试这个：

\documentclass[11pt,a4paper,twoside,openright]{report}

\usepackage{setspace}
\usepackage{graphicx}
\usepackage{tabularx}
\usepackage{tabu}
\usepackage{afterpage}
\usepackage{amsmath,amssymb}            
\usepackage{rotating}  
\usepackage{fancyhdr}  
\usepackage[scriptsize]{caption} 
\hyphenation{a-gen-tiz-za-zio-ne}
\usepackage{float}
\usepackage[parfill]{parskip}
\usepackage{multicol}
\usepackage{siunitx}
\usepackage{amsmath}

\graphicspath{ {images/} }

\usepackage[a4paper,lmargin=2cm,rmargin=2cm]{geometry}

\newcommand*{\diff}{\mathop{}\!\mathrm{d}}

\newcommand*{\var}[1]{\texttt{#1}}

\usepackage[USenglish]{babel}
\usepackage[latin1]{inputenc}
\renewcommand{\captionfont}{\normalfont \sffamily \itshape \small}

\pagestyle{empty}



\begin{document}



F.W.Zok \cite{R34} has analyzed metalic sandwich panels with textile cores  subject to combined bending and shear and then designed for minimum weight. Basic results for the weight benefits relative to solid plates are presented, with emphasis on restricted optimizations that assure robustness (non-catastrophic failure) and acceptable thinness. Select numerical simulations are used to check the analytical results and to explore the role of strain hardening beyond failure initiation. Comparisons are made with competing concepts, especially honeycomb and truss core systems. It is demonstrated that all three systems have essentially equivalent performance. The influence on the design of a concentrated compressive stress that might crush the core has been explored and found to produce relatively small effect over the stress range of practical interest. ``Angle ply'' cores with members in the $\pm \ang{45}$ orientation are found to be near optimal for all combinations of bending, shear and compression.

\end{document}

这是引号字符Angle ply。这是一个非常常见的复制粘贴编码错误。在将来，请发布一个最小的工作示例 - 如果您尝试将它们放在一起，您可能会在过程中发现问题：）。

此外，我的强迫症倾向恳求你删除你的序言行，\usepackage{amsmath}因为你已经在\usepackage{amsmath,amssymb}它上面了。