Functional Requirements

This section provides the functional requirements, the tasks and behaviours that the software is expected to complete.

Input-Values: Input the values from Tab:ReqInputs, which define the glass dimensions, type of glass, tolerable probability of failure, and the characteristics of the blast.

System-Set-Values-Following-Assumptions: The system shall set the known values as described in the table for Required Assignments.

Check-Input-with-Data_Constraints: The system shall check the entered input values to ensure that they do not exceed the data constraints. If any of the input values are out of bounds, an error message is displayed and the calculations stop.

Output-Values-and-Known-Values: Output the input values from FR:Input-Values and the known values from FR:System-Set-Values-Following-Assumptions.

Check-Glass-Safety: If $\mathit{isSafePb}\land{}\mathit{isSafeLR}$ (from IM:isSafePb and IM:isSafeLR), output the message “For the given input parameters, the glass is considered safe.” If the condition is false, then output the message “For the given input parameters, the glass is NOT considered safe.”

Output-Values: Output the values from the table for Required Outputs.

Symbol	Description	Units
$a$	Plate length (long dimension)	${\text{m}}$
$b$	Plate width (short dimension)	${\text{m}}$
$g$	Glass type	–
${P_{\text{b}\text{tol}}}$	Tolerable probability of breakage	–
${\mathit{SD}_{\text{x}}}$	Stand off distance ( $x$ -component)	${\text{m}}$
${\mathit{SD}_{\text{y}}}$	Stand off distance ( $y$ -component)	${\text{m}}$
${\mathit{SD}_{\text{z}}}$	Stand off distance ( $z$ -component)	${\text{m}}$
$t$	Nominal thickness t is in ${2.5,2.7,3.0,4.0,5.0,6.0,8.0,10.0,12.0,16.0,19.0,22.0}$	${\text{mm}}$
$\mathit{TNT}$	TNT equivalent factor	–
$w$	Charge weight	${\text{kg}}$

Required Inputs

Symbol	Description	Source	Units
$\mathit{AR}$	Aspect ratio	DD:aspectRatio	–
$E$	Modulus of elasticity of glass	A:standardValues	${\text{Pa}}$
$\mathit{GTF}$	Glass type factor	DD:gTF	–
$h$	Minimum thickness	DD:minThick	${\text{m}}$
$k$	Surface flaw parameter	A:standardValues	$\frac{\text{m}^{12}}{\text{N}^{7}}$
$\mathit{LDF}$	Load duration factor	DD:loadDurFactor	–
$\mathit{LSF}$	Load share factor	A:glassLite	–
$m$	Surface flaw parameter	A:standardValues	$\frac{\text{m}^{12}}{\text{N}^{7}}$
$\mathit{SD}$	Stand off distance	DD:standOffDist	${\text{m}}$
${t_{\text{d}}}$	Duration of load	A:standardValues	${\text{s}}$

Required Assignments

Symbol	Description	Source	Units
$\mathit{AR}$	Aspect ratio	DD:aspectRatio	–
$B$	Risk of failure	IM:riskFun	–
$\mathit{GTF}$	Glass type factor	DD:gTF	–
$h$	Minimum thickness	DD:minThick	${\text{m}}$
$\mathit{isSafeLR}$	3 second load equivalent resistance safety requirement	IM:isSafeLR	–
$\mathit{isSafePb}$	Probability of glass breakage safety requirement	IM:isSafePb	–
$J$	Stress distribution factor (Function)	IM:stressDistFac	–
${J_{\text{tol}}}$	Tolerable stress distribution factor	IM:sdfTol	–
$\mathit{LR}$	Load resistance	IM:calofCapacity	${\text{Pa}}$
$\mathit{NFL}$	Non-factored load	IM:nFL	${\text{Pa}}$
${P_{\text{b}}}$	Probability of breakage	IM:probOfBreak	–
$\hat{q}$	Dimensionless load	IM:dimlessLoad	–
${\hat{q}_{\text{tol}}}$	Tolerable load	IM:tolLoad	–

Required Outputs

Software Requirements Specification for GlassBR

Functional Requirements